11 years agoNFS: Ensure that rpc_run_task() errors are propagated back to the caller
Trond Myklebust [Mon, 14 Apr 2008 18:54:53 +0000]
NFS: Ensure that rpc_run_task() errors are propagated back to the caller

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Ensure that the write code cleans up properly when rpc_run_task() fails
Trond Myklebust [Tue, 15 Apr 2008 20:56:39 +0000]
NFS: Ensure that the write code cleans up properly when rpc_run_task() fails

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Ensure that the read code cleans up properly when rpc_run_task() fails
Trond Myklebust [Tue, 15 Apr 2008 20:33:58 +0000]
NFS: Ensure that the read code cleans up properly when rpc_run_task() fails

In the case of readpage() we need to ensure that the pages get unlocked,
and that the error is flagged.

In the case of O_DIRECT, we need to ensure that the pages are all released.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Fix nfs_wb_page() to always exit with an error or a clean page
Trond Myklebust [Fri, 11 Apr 2008 20:03:54 +0000]
NFS: Fix nfs_wb_page() to always exit with an error or a clean page

It is possible for nfs_wb_page() to sometimes exit with 0 return value, yet
the page is left in a dirty state.
For instance in the case where the server rebooted, and the COMMIT request
failed, then all the previously "clean" pages which were cached by the
server, but were not guaranteed to have been writted out to disk,
have to be redirtied and resent to the server.
The fix is to have nfs_wb_page_priority() check that the page is clean
before it exits...

This fixes a condition that triggers the BUG_ON(PagePrivate(page)) in
nfs_create_request() when we're in the nfs_readpage() path.

Also eliminate a redundant BUG_ON(!PageLocked(page)) while we're at it. It
turns out that clear_page_dirty_for_io() has the exact same test.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoSUNRPC: Don't attempt to destroy expired RPCSEC_GSS credentials..
Trond Myklebust [Sat, 19 Apr 2008 18:22:31 +0000]
SUNRPC: Don't attempt to destroy expired RPCSEC_GSS credentials..

..and always destroy using a 'soft' RPC call. Destroying GSS credentials
isn't mandatory; the server can always cope with a few credentials not
getting destroyed in a timely fashion.

This actually fixes a hang situation. Basically, some servers will decide
that the client is crazy if it tries to destroy an RPC context for which
they have sent an RPCSEC_GSS_CREDPROBLEM, and so will refuse to talk to it
for a while.
The regression therefor probably was introduced by commit
0df7fb74fbb709591301871a38aac7735a1d6583.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoSUNRPC: Fix up xprt_write_space()
Trond Myklebust [Thu, 17 Apr 2008 22:52:19 +0000]
SUNRPC: Fix up xprt_write_space()

The rest of the networking layer uses SOCK_ASYNC_NOSPACE to signal whether
or not we have someone waiting for buffer memory. Convert the SUNRPC layer
to use the same idiom.
Remove the unlikely()s in xs_udp_write_space and xs_tcp_write_space. In
fact, the most common case will be that there is nobody waiting for buffer
space.

SOCK_NOSPACE is there to tell the TCP layer whether or not the cwnd was
limited by the application window. Ensure that we follow the same idiom as
the rest of the networking layer here too.

Finally, ensure that we clear SOCK_ASYNC_NOSPACE once we wake up, so that
write_space() doesn't keep waking things up on xprt->pending.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoSUNRPC: Fix a bug in call_decode()
Trond Myklebust [Sat, 19 Apr 2008 17:15:47 +0000]
SUNRPC: Fix a bug in call_decode()

call_verify() can, under certain circumstances, free the RPC slot. In that
case, our cached pointer 'req = task->tk_rqstp' is invalid. Bug was
introduced in commit 220bcc2afd7011b3e0569fc178331fa983c92c1b (SUNRPC:
Don't call xprt_release in call refresh).

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: introduce new function to encode private argument in SM_MON requests
Chuck Lever [Fri, 14 Mar 2008 18:26:08 +0000]
lockd: introduce new function to encode private argument in SM_MON requests

Clean up: refactor the encoding of the opaque 16-byte private argument in
xdr_encode_mon().  This will be updated later to support IPv6 addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: Fix up incorrect RPC buffer size calculations.
Chuck Lever [Fri, 14 Mar 2008 18:26:01 +0000]
lockd: Fix up incorrect RPC buffer size calculations.

Switch to using the new mon_id encoder function.

Now that we've refactored the encoding of SM_MON requests, we've
discovered that the pre-computed buffer length maximums are
incorrect!

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: document use of mon_id argument in SM_MON requests
Chuck Lever [Fri, 14 Mar 2008 18:25:53 +0000]
lockd: document use of mon_id argument in SM_MON requests

Clean up: document the argument type that xdr_encode_common() is
marshalling by introducing a new function.  The new function will replace
xdr_encode_common() in just a sec.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: refactor SM_MON my_id argument encoder
Chuck Lever [Fri, 14 Mar 2008 18:25:46 +0000]
lockd: refactor SM_MON my_id argument encoder

Clean up: introduce a new XDR encoder specifically for the my_id
argument of SM_MON requests.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: refactor SM_MON mon_name argument encoder
Chuck Lever [Fri, 14 Mar 2008 18:25:39 +0000]
lockd: refactor SM_MON mon_name argument encoder

Clean up: introduce a new XDR encoder specifically for the mon_name
argument of SM_MON requests.  This will be updated later to support IPv6
addresses in addition to IPv4 addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: Ensure NSM strings aren't longer than protocol allows
Chuck Lever [Fri, 14 Mar 2008 18:25:32 +0000]
lockd: Ensure NSM strings aren't longer than protocol allows

Introduce a special helper function to check the length of NSM strings
before they are placed on the wire.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agolockd: bring a few function declarations up to date
Chuck Lever [Fri, 14 Mar 2008 18:18:45 +0000]
lockd: bring a few function declarations up to date

Clean-up: replace  __inline__ and use up-to-date function declaration
conventions.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNLM: NLM protocol version numbers are u32
Chuck Lever [Fri, 14 Mar 2008 18:18:37 +0000]
NLM: NLM protocol version numbers are u32

Clean up: RPC protocol version numbers are u32.  Make sure we use an
appropriate type for NLM version numbers when calling nlm_lookup_host().

Eliminates a harmless mixed sign comparison in nlm_host_lookup().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNLM: LOCKD fails to load if CONFIG_SYSCTL is not set
Chuck Lever [Fri, 14 Mar 2008 18:18:30 +0000]
NLM: LOCKD fails to load if CONFIG_SYSCTL is not set

Bruce Fields says:
"By the way, we've got another config-related nit here:

http://bugzilla.linux-nfs.org/show_bug.cgi?id=156

You can build lockd without CONFIG_SYSCTL set, but then the module will
fail to load."

For now, disable the sysctl registration calls in lockd if CONFIG_SYSCTL
is not enabled.  This allows the kernel to build properly if PROC_FS or
SYSCTL is not enabled, but an NFS client is desired.

In the long run, we would like to be able to build the kernel with an
NFS client but without lockd.  This makes sense, for example, if you want
an NFSv4-only NFS client, as NFSv4 doesn't use NLM at all.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoSUNRPC: Add a default setting for CONFIG_SUNRPC_BIND34
Chuck Lever [Fri, 14 Mar 2008 18:15:18 +0000]
SUNRPC: Add a default setting for CONFIG_SUNRPC_BIND34

Most distros will want support for rpcbind protocols 3 and 4 to default off
until they have integrated user-space support for the new rpcbind daemon
which supports IPv6 RPC services.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoSUNRPC: Update help Kconfig text
Chuck Lever [Fri, 14 Mar 2008 18:15:11 +0000]
SUNRPC: Update help Kconfig text

Clean up: refresh the help text for Kconfig items related to the sunrpc
module.  Remove obsolete URLs, and make the language consistent among
the options.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Always enable NFS direct I/O
Chuck Lever [Fri, 14 Mar 2008 18:14:56 +0000]
NFS: Always enable NFS direct I/O

Since O_DIRECT is a standard feature that is enabled in most distros,
eliminate the CONFIG_NFS_DIRECTIO build option, and change the
fs/nfs/Makefile to always build in the NFS direct I/O engine.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Show most mount options via nfs_show_options()
Chuck Lever [Fri, 14 Mar 2008 18:10:37 +0000]
NFS: Show most mount options via nfs_show_options()

Display all mount options in /proc/mount which may be needed to reconstruct
a previous mount.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Save the values of the "mount*=" mount options
Chuck Lever [Fri, 14 Mar 2008 18:10:30 +0000]
NFS: Save the values of the "mount*=" mount options

Save the value of the mountproto= mountport= mountvers= and mountaddr=
options so that these values can be displayed later via
nfs_show_options().

This preserves the intent of the original mount options, should the file
system need to be remounted based on what's displayed in /proc/mounts.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Save the value of the "port=" mount option
Chuck Lever [Fri, 14 Mar 2008 18:10:22 +0000]
NFS: Save the value of the "port=" mount option

During a remount based on the mount options displayed in /proc/mounts, we
want to preserve the original behavior of the mount request.  Let's save
the original setting of the "port=" mount option in the mount's nfs_server
structure.

This allows us to simplify the default behavior of port setting for NFSv4
mounts: by default, NFSv2/3 mounts first try an RPC bind to determine the
NFS server's port, unless the user specified the "port=" mount option;
Users can force the client to skip the RPC bind by explicitly specifying
"port=<value>".

NFSv4, by contrast, assumes the NFS server port is 2049 and skips the RPC
bind, unless the user specifies "port=".  Users can force an RPC bind for
NFSv4 by explicitly specifying "port=0".

I added a couple of extra comments to clarify this behavior.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: Fix up data types of fields in nfs_parsed_mount_options
Chuck Lever [Fri, 14 Mar 2008 18:10:15 +0000]
NFS: Fix up data types of fields in nfs_parsed_mount_options

Clean up: make data types of fields in nfs_parsed_mount_options more
consistent with other uses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: numeric mount parameters are unsigned
Chuck Lever [Fri, 14 Mar 2008 18:10:08 +0000]
NFS: numeric mount parameters are unsigned

Clean up: use %u instead of %d when displaying NFS mount options.

Nit: Fix reporting of "namlen=" option in nfs_show_mount_stats.  The mount
option is called "namlen" without the "e".

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: clean up short packet handling for NFSv4 readdir
Jeff Layton [Fri, 22 Feb 2008 19:50:01 +0000]
NFS: clean up short packet handling for NFSv4 readdir

Currently, the NFS readdir decoders have a workaround for buggy servers
that send an empty readdir response with the EOF bit unset. If the
server sends a malformed response in some cases, this workaround kicks
in and just returns an empty response rather than returning a proper
error to the caller.

This patch does 3 things:

1) have malformed responses with no entries return error (-EIO)

2) preserve existing workaround for servers that send empty
   responses with the EOF marker unset.

3) Add some comments to clarify the logic in decode_readdir().

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: clean up short packet handling for NFSv3 readdir
Jeff Layton [Fri, 22 Feb 2008 19:50:00 +0000]
NFS: clean up short packet handling for NFSv3 readdir

Currently, the NFS readdir decoders have a workaround for buggy servers
that send an empty readdir response with the EOF bit unset. If the
server sends a malformed response in some cases, this workaround kicks
in and just returns an empty response rather than returning a proper
error to the caller.

This patch does 3 things:

1) have malformed responses with no entries return error (-EIO)

2) preserve existing workaround for servers that send empty
   responses with the EOF marker unset.

3) Add some comments to clarify the logic in nfs3_xdr_readdirres().

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoNFS: clean up short packet handling for NFSv2 readdir
Jeff Layton [Fri, 22 Feb 2008 19:49:59 +0000]
NFS: clean up short packet handling for NFSv2 readdir

Currently, the NFS readdir decoders have a workaround for buggy servers
that send an empty readdir response with the EOF bit unset. If the
server sends a malformed response in some cases, this workaround kicks
in and just returns an empty response rather than returning a proper
error to the caller.

This patch does 3 things:

1) have malformed responses with no entries return error (-EIO)

2) preserve existing workaround for servers that send empty
   responses with the EOF marker unset.

3) Add some comments to clarify the logic in nfs_xdr_readdirres().

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agonfs: remove duplicate initializations of nfs_read_data field
Fred Isaman [Wed, 19 Mar 2008 15:54:04 +0000]
nfs: remove duplicate initializations of nfs_read_data field

Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agonfs: nfs_redirty_request
Fred [Wed, 19 Mar 2008 15:24:38 +0000]
nfs: nfs_redirty_request

Both flush functions have the same error handling routine.  Pull
it out as a function.

Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoMerge branch 'hotfixes' into devel
Trond Myklebust [Wed, 19 Mar 2008 21:59:44 +0000]
Merge branch 'hotfixes' into devel

11 years agonfs: don't ignore return value from nfs_pageio_add_request
Fred Isaman [Wed, 19 Mar 2008 15:24:39 +0000]
nfs: don't ignore return value from nfs_pageio_add_request

Ignoring the return value from nfs_pageio_add_request can cause deadlocks.

In read path:
  call nfs_pageio_add_request from readpage_async_filler
  assume at this point that there are requests already in desc, that
    can't be merged with the current request.
  so nfs_pageio_doio is fired up to clear out desc.
  assume something goes wrong in setting up the io, so desc->pg_error is set.
  This causes nfs_pageio_add_request to return 0, *WITHOUT* adding the original
    request.
  BUT, since return code is ignored, readpage_async_filler assumes it has
    been added, and does nothing further, leaving page locked.
  do_generic_mapping_read will eventually call lock_page, resulting in deadlock

In write path:
  page is marked dirty by generic_perform_write
  nfs_writepages is called
  call nfs_pageio_add_request from nfs_page_async_flush
  assume at this point that there are requests already in desc, that
    can't be merged with the current request.
  so nfs_pageio_doio is fired up to clear out desc.
  assume something goes wrong in setting up the io, so desc->pg_error is set.
  This causes nfs_page_async_flush to return 0, *WITHOUT* adding the original
    request, yet marking the request as locked (PG_BUSY) and in writeback,
    clearing dirty marks.
  The next time a write is done to the page, deadlock will result as
    nfs_write_end calls nfs_update_request

Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

11 years agoMerge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
Linus Torvalds [Wed, 19 Mar 2008 04:34:48 +0000]
Merge branch 'fixes' of git://git./linux/kernel/git/djbw/async_tx

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
  async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor
  fsldma: Fix the DMA halt when using DMA_INTERRUPT async_tx transfer.

11 years agoRevert "ACPI: EC: Handle IRQ storm on Acer laptops"
Alexey Starikovskiy [Tue, 18 Mar 2008 23:45:12 +0000]
Revert "ACPI: EC: Handle IRQ storm on Acer laptops"

This reverts commit 2c81ce4c9c37b910210f2640c28e98a0c398dc26.

It caused several new troubles (eg suspend slowdown bisected down to
this patch by Pavel Machek), so just revert it for now.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Cc: Pavel Machek <pavel@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux...
Linus Torvalds [Wed, 19 Mar 2008 04:27:13 +0000]
Merge branch 'for-linus' of git://git./linux/kernel/git/mingo/linux-2.6-sched-devel

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel:
  sched: tune multi-core idle balancing
  sched: retune wake granularity
  sched: wakeup-buddy tasks are cache-hot
  sched: improve affine wakeups
  sched, net: socket wakeups are sync
  sched: clean up wakeup balancing, code flow
  sched: clean up wakeup balancing, rename variables
  sched: clean up wakeup balancing, move wake_affine()

11 years agoIDE: Make taskfile interface more robust wrt unexpected end-of-command
Linus Torvalds [Wed, 19 Mar 2008 04:26:24 +0000]
IDE: Make taskfile interface more robust wrt unexpected end-of-command

Now that we handle all the special commands using REQ_TYPE_ATA_TASKFILE
rather than using the old REQ_TYPE_ATA_CMD model, we need to also
emulate the lack of full taskfile data that comes with the old command
model (ie when commands are generated with the HDIO_DRIVE_CMD ioctl
rather than using the HDIO_DRIVE_TASK[FILE] ioctls).

In particular, this means that we should handle command completion the
more relaxed way that the old drive_cmd_intr() code did.  It allows
commands to finish early even if they don't use up all the data that we
thought we had for them.

This fixes a regression seen by Anders Eriksson where some SMART
commands sent by smartd would cause a boot-time system hang on his
machine because the IDE command handling code didn't realize that the
command had completed.

Tested-by: Anders Eriksson <aeriksson@fastmail.fm>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

11 years agoMerge branch 'slab-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm
Linus Torvalds [Wed, 19 Mar 2008 04:13:19 +0000]
Merge branch 'slab-linus' of git://git./linux/kernel/git/christoph/vm

* 'slab-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm:
  slub page alloc fallback: Enable interrupts for GFP_WAIT.

11 years agosched: tune multi-core idle balancing
Ingo Molnar [Sun, 16 Mar 2008 10:14:30 +0000]
sched: tune multi-core idle balancing

WAKE_IDLE is too agressive on multi-core CPUs with the new
wake-affine code, keep it on for SMT/HT balancing alone
(where there's no cache affinity at all between logical CPUs).

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched: retune wake granularity
Ingo Molnar [Tue, 18 Mar 2008 17:47:57 +0000]
sched: retune wake granularity

reduce wake-up granularity for better interactivity.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched: wakeup-buddy tasks are cache-hot
Ingo Molnar [Sat, 15 Mar 2008 16:10:34 +0000]
sched: wakeup-buddy tasks are cache-hot

Wakeup-buddy tasks are cache-hot - this makes it a bit harder
for the load-balancer to tear them apart. (but it's still possible,
if the load is sufficiently assymetric)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched: improve affine wakeups
Ingo Molnar [Wed, 19 Mar 2008 00:42:00 +0000]
sched: improve affine wakeups

improve affine wakeups. Maintain the 'overlap' metric based on CFS's
sum_exec_runtime - which means the amount of time a task executes
after it wakes up some other task.

Use the 'overlap' for the wakeup decisions: if the 'overlap' is short,
it means there's strong workload coupling between this task and the
woken up task. If the 'overlap' is large then the workload is decoupled
and the scheduler will move them to separate CPUs more easily.

( Also slightly move the preempt_check within try_to_wake_up() - this has
  no effect on functionality but allows 'early wakeups' (for still-on-rq
  tasks) to be correctly accounted as well.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched, net: socket wakeups are sync
Ingo Molnar [Wed, 19 Mar 2008 00:44:24 +0000]
sched, net: socket wakeups are sync

'sync' wakeups are a hint towards the scheduler that (certain)
networking related wakeups likely create coupling between tasks.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched: clean up wakeup balancing, code flow
Ingo Molnar [Sun, 16 Mar 2008 20:21:47 +0000]
sched: clean up wakeup balancing, code flow

Clean up the code flow. No code changed:

kernel/sched.o:

   text    data     bss     dec     hex filename
  42521    2858     232   45611    b22b sched.o.before
  42521    2858     232   45611    b22b sched.o.after

md5:
   09b31c44e9aff8666f72773dc433e2df  sched.o.before.asm
   09b31c44e9aff8666f72773dc433e2df  sched.o.after.asm

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched: clean up wakeup balancing, rename variables
Ingo Molnar [Sun, 16 Mar 2008 19:56:26 +0000]
sched: clean up wakeup balancing, rename variables

rename 'cpu' to 'prev_cpu'. No code changed:

kernel/sched.o:

   text    data     bss     dec     hex filename
  42521    2858     232   45611    b22b sched.o.before
  42521    2858     232   45611    b22b sched.o.after

md5:
   09b31c44e9aff8666f72773dc433e2df  sched.o.before.asm
   09b31c44e9aff8666f72773dc433e2df  sched.o.after.asm

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agosched: clean up wakeup balancing, move wake_affine()
Ingo Molnar [Sun, 16 Mar 2008 19:36:10 +0000]
sched: clean up wakeup balancing, move wake_affine()

split out the affine-wakeup bits.

No code changed:

kernel/sched.o:

   text    data     bss     dec     hex filename
  42521    2858     232   45611    b22b sched.o.before
  42521    2858     232   45611    b22b sched.o.after

md5:
   9d76738f1272aa82f0b7affd2f51df6b  sched.o.before.asm
   09b31c44e9aff8666f72773dc433e2df  sched.o.after.asm

(the md5's changed because stack slots changed and some registers
get scheduled by gcc in a different order - but otherwise the before
and after assembly is instruction for instruction equivalent.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

11 years agoasync_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor
Dan Williams [Wed, 19 Mar 2008 04:23:59 +0000]
async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor

If the channel cannot perform the operation in one call to
->device_prep_dma_zero_sum, then fallback to the xor+page_is_zero path.
This only affects users with arrays larger than 16 devices on iop13xx or
32 devices on iop3xx.

Cc: <stable@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

11 years agofsldma: Fix the DMA halt when using DMA_INTERRUPT async_tx transfer.
Zhang Wei [Wed, 19 Mar 2008 01:45:00 +0000]
fsldma: Fix the DMA halt when using DMA_INTERRUPT async_tx transfer.

The DMA_INTERRUPT async_tx is a NULL transfer, thus the BCR(count register)
is 0. When the transfer started with a byte count of zero, the DMA
controller will triger a PE(programming error) event and halt, not a normal
interrupt. I add special codes for PE event and DMA_INTERRUPT
async_tx testing.

Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

11 years agoMerge branch 'audit.b49' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit...
Linus Torvalds [Tue, 18 Mar 2008 15:43:59 +0000]
Merge branch 'audit.b49' of git://git./linux/kernel/git/viro/audit-current

* 'audit.b49' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current:
  [PATCH] export sessionid alongside the loginuid in procfs

11 years ago[PATCH] export sessionid alongside the loginuid in procfs
Eric Paris [Thu, 13 Mar 2008 12:15:31 +0000]
[PATCH] export sessionid alongside the loginuid in procfs

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
Linus Torvalds [Tue, 18 Mar 2008 14:49:59 +0000]
Merge branch 'for-linus' of git://git./linux/kernel/git/jikos/hid

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
  HID: update key codes for Apple aluminium
  HID: fix comment in hid_input_report()
  HID: BADPAD entry for NATSU Playstation USB adapter
  HID: Use DIV_ROUND_UP
  HID: remove HID_QUIRK_APPLE_ISO_KEYBOARD for 4th generation macbook

11 years agoMerge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
Linus Torvalds [Tue, 18 Mar 2008 14:48:23 +0000]
Merge branch 'release' of git://git./linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
  ACPI: Set flag DOCK_UNDOCKING when triggered via sysfs
  Revert "ACPI: video: Ignore devices that aren't present in hardware"
  asus_acpi: remove misleading mask
  Revert "ACPI: video: Ignore ACPI video devices that aren't present in hardware"
  thermal: delete "default y"
  thermal: re-document thermal units
  Revert "thermal: fix generic thermal I/F for hwmon"
  ACPI: fix ATA_ACPI build
  ACPI: battery: Don't return -EFAIL on broken packages.
  ACPI: lockdep warning on boot, 2.6.25-rc5

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Tue, 18 Mar 2008 14:46:19 +0000]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: ALPS - fix forward/back buttons reversed on Acer 5520-5290
  Input: ALPS - put secondary device in proper place in sysfs
  Input: wacom - add support for Bamboo1, BambooFun, and Cintiq 12WX
  Input: document i8042.noloop
  Input: add keyboard notifier documentation
  Input: ads7846 - fix uninitialized var warning
  Input: i8042 - add SNI RM support
  Input: i8042 - add Lenovo 3000 N100 to nomux blacklist
  Input: i8042 - fix warning on non-x86 builds
  Input: cobalt_btns - assorted fixes

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
Linus Torvalds [Tue, 18 Mar 2008 14:44:21 +0000]
Merge branch 'for-linus' of git://git./linux/kernel/git/jmorris/selinux-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/selinux-2.6:
  make selinux_parse_opts_str() static

11 years agoMerge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
Linus Torvalds [Tue, 18 Mar 2008 14:43:14 +0000]
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  Revert "unexport bio_{,un}map_user"
  relay: fix subbuf_splice_actor() adding too many pages
  The ps2esdi driver was marked as BROKEN more than two years ago due to being

11 years agoMerge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
Linus Torvalds [Tue, 18 Mar 2008 14:32:23 +0000]
Merge branch 'drm-fixes' of git://git./linux/kernel/git/airlied/drm-2.6

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/ati_pcigart: fix the PCIGART to use drm_pci to allocate GART table.
  drm/radeon: fixup RV550 chip family
  drm/via: attempt again to stabilise the AGP DMA command submission.
  drm: Fix race that can lockup the kernel

11 years agoHID: update key codes for Apple aluminium
Michael Hanselmann [Mon, 17 Mar 2008 21:23:52 +0000]
HID: update key codes for Apple aluminium

F5 and F6 have no second function printed on them. Thus their definitions have
been removed from the table.

KEY_CYCLEWINDOWS doesn't name the function of Mac OS X' Expose properly and
because we couldn't find a better key code, we decided to use KEY_FN_F4
instead.

We also changed KEY_BACK and KEY_FORWARD, which apply to browser functions, to
KEY_PREVIOUSSONG and KEY_NEXTSONG, since the keys are intended to control a
music player.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

11 years agoHID: fix comment in hid_input_report()
Jiri Kosina [Tue, 4 Mar 2008 12:53:33 +0000]
HID: fix comment in hid_input_report()

The hid_input_report() in debug mode of course outputs the report itself, not
the device report descriptor.

Fix this error in comment.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>

11 years agoHID: BADPAD entry for NATSU Playstation USB adapter
Andrew Burton [Mon, 3 Mar 2008 09:49:59 +0000]
HID: BADPAD entry for NATSU Playstation USB adapter

Add quirk entry for BADPAD for the NATSU Playstation USB adapter. The
adapter is supported under Linux, but with bad direction detection.

Signed-off-by: Andrew Burton <adb@iinet.net.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

11 years agoHID: Use DIV_ROUND_UP
Julia Lawall [Fri, 15 Feb 2008 12:53:11 +0000]
HID: Use DIV_ROUND_UP

The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

11 years agoHID: remove HID_QUIRK_APPLE_ISO_KEYBOARD for 4th generation macbook
Tobias Mueller [Fri, 14 Mar 2008 22:44:48 +0000]
HID: remove HID_QUIRK_APPLE_ISO_KEYBOARD for 4th generation macbook

4th generation MacBook (product id 0x022a) from Apple doesn't need
HID_QUIRK_APPLE_ISO_KEYBOARD fix anymore.

Signed-off-by: Tobias Mueller <Tobias_Mueller@twam.info>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

11 years agoMerge branches 'release' and 'dock' into release
Len Brown [Tue, 18 Mar 2008 09:17:15 +0000]
Merge branches 'release' and 'dock' into release

11 years agoACPI: Set flag DOCK_UNDOCKING when triggered via sysfs
Holger Macht [Wed, 12 Mar 2008 00:07:27 +0000]
ACPI: Set flag DOCK_UNDOCKING when triggered via sysfs

begin_undock() is only called when triggered via a acpi notify handler
(pressing the undock button on the dock station), but complete_undock() is
always called after the eject. So if a undock is triggered through a sysfs
write, the flag DOCK_UNDOCKING has to be set for the dock station,
too. Otherwise this will freeze the system hard.

Signed-off-by: Holger Macht <hmacht@suse.de>
Acked-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

11 years agoMerge branches 'release', 'asus', 'bugzilla-8573', 'bugzilla-9995', 'bugzilla-10272...
Len Brown [Tue, 18 Mar 2008 08:52:57 +0000]
Merge branches 'release', 'asus', 'bugzilla-8573', 'bugzilla-9995', 'bugzilla-10272', 'lockdep' and 'thermal' into release

11 years agoRevert "ACPI: video: Ignore devices that aren't present in hardware"
Len Brown [Tue, 18 Mar 2008 08:04:35 +0000]
Revert "ACPI: video: Ignore devices that aren't present in hardware"

This reverts commit 0119509c4fbc9adcef1472817fda295334612976.

http://bugzilla.kernel.org/show_bug.cgi?id=9995

Signed-off-by: Len Brown <len.brown@intel.com>

11 years agoasus_acpi: remove misleading mask
Julia Lawall [Tue, 4 Mar 2008 23:00:13 +0000]
asus_acpi: remove misleading mask

led_out is boolean, so there is no functional change here,
but apparently an extra mask with 1 caused some style checkers
to flag this as logic bug.

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Luca Tettamanti <kronos.it@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

11 years agoRevert "ACPI: video: Ignore ACPI video devices that aren't present in hardware"
Len Brown [Tue, 18 Mar 2008 05:43:53 +0000]
Revert "ACPI: video: Ignore ACPI video devices that aren't present in hardware"

This reverts commit 3fa2cdcc45a0176de15cac9dbf4ed2834ebf8932.

http://bugzilla.kernel.org/show_bug.cgi?id=9995

Signed-off-by: Len Brown <len.brown>

11 years agothermal: delete "default y"
Len Brown [Tue, 18 Mar 2008 05:22:10 +0000]
thermal: delete "default y"

The generic thermal I/F gets selected by ACPI_THERMAL --
its only current customer.
it doesn't need to clutter other configs by default.

Signed-off-by: Len Brown <len.brown@intel.com>

11 years agothermal: re-document thermal units
Zhang, Rui [Tue, 18 Mar 2008 02:40:29 +0000]
thermal: re-document thermal units
From: Zhang Rui <rui.zhang@intel.com>

(reverting the previous sysfs patch also reverted a fix
 to the thermal units documentation, which is restored by this commit)

The generic thermal driver shows temperature in millidegree Celsius.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

11 years agoRevert "thermal: fix generic thermal I/F for hwmon"
Len Brown [Tue, 18 Mar 2008 05:14:37 +0000]
Revert "thermal: fix generic thermal I/F for hwmon"

This reverts commit 3152fb9f11cdd2fd8688c2c5cb805e5c09b53dd9.

This broke libsensors.

Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Len Brown <len.brown@intel.com>

11 years agoInput: ALPS - fix forward/back buttons reversed on Acer 5520-5290
Laszlo Kajan [Tue, 18 Mar 2008 04:39:55 +0000]
Input: ALPS - fix forward/back buttons reversed on Acer 5520-5290

ALPS_FW_BK_1 protocol flavor seems to have forward and backward
keys reversed.

Signed-off-by: Laszlo Kajan <kajla@bioinfo.pl>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

11 years agoInput: ALPS - put secondary device in proper place in sysfs
Dmitry Torokhov [Tue, 18 Mar 2008 04:29:18 +0000]
Input: ALPS - put secondary device in proper place in sysfs

Secondary input device did not have parent set up causing it
to appear in the root of sysfs device hierarchy.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

11 years agoACPI: fix ATA_ACPI build
Len Brown [Tue, 18 Mar 2008 04:26:07 +0000]
ACPI: fix ATA_ACPI build

drivers/ata/libata-acpi.c fails to build

drivers/built-in.o: In function `ata_acpi_associate':
(.text+0x7106a): undefined reference to `register_hotplug_dock_device'

When CONFIG_ATA_ACPI=y and CONFIG_ACPI_DOCK=m
But if dock is selected from ata_acpi, dock will =y
when ata_acpi=y, avoiding this problem.

http://bugzilla.kernel.org/show_bug.cgi?id=10272

Signed-off-by: Len Brown <len.brown@intel.com>

11 years agoACPI: battery: Don't return -EFAIL on broken packages.
Alexey Starikovskiy [Tue, 18 Mar 2008 02:37:42 +0000]
ACPI: battery: Don't return -EFAIL on broken packages.

Acer BIOS has a bug which is exposed when a dead battery is present.

The package template that is used to describe battery status is
over-written with sane values when the battery is live.
But when the batter is dead, a bogus reference in the template
is used.  In this case, Linux returns a fault, when instead
it should simply return that it doesn't know the missing value.

http://bugzilla.kernel.org/show_bug.cgi?id=8573
http://bugzilla.kernel.org/show_bug.cgi?id=10202

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

11 years agopciehp: don't enable slot unless forced
Mark Lord [Mon, 17 Mar 2008 20:04:23 +0000]
pciehp: don't enable slot unless forced

This fixes a 2.6.25 regression reported by Alex Chiang.

Invoke pciehp_enable_slot() at startup only when pciehp_force=1.
Some HP equipment apparently cannot cope with it otherwise.

This restores the (previously working) 2.6.24 behaviour here,
while allowing machines that need a kick to use pciehp_force=1.

This was the original design back in October 2007,
but Kristen suggested we try without it first:

   Kristen Carlson Accardi wrote:
   >I think it would be ok to try allowing the slot to be enabled when not
   >using pciehp_force mode.  We can wrap it later if it proves to break things

This ended up breaking one of Alex's setups,
so it's time to put the wrapper back in now.

Signed-off-by: Mark Lord <mlord@pobox.com>
Acked-by: Alex Chiang <achiang@hp.com>
Acked-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

11 years agomake selinux_parse_opts_str() static
Adrian Bunk [Mon, 17 Mar 2008 20:29:23 +0000]
make selinux_parse_opts_str() static

This patch makes the needlessly global selinux_parse_opts_str() static.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

11 years agoRevert "unexport bio_{,un}map_user"
Jens Axboe [Mon, 17 Mar 2008 20:14:40 +0000]
Revert "unexport bio_{,un}map_user"

Outside users like asmlib uses the mapping functions. API wise, the
export is definitely sane. It's a better idea to keep this export
than to require external users to open-code this piece of code instead.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

11 years agoslub page alloc fallback: Enable interrupts for GFP_WAIT.
Christoph Lameter [Thu, 13 Mar 2008 06:57:49 +0000]
slub page alloc fallback: Enable interrupts for GFP_WAIT.

The fallback path needs to enable interrupts like done for
the other page allocator calls. This was not necessary with
the alternate fast path since we handled irq enable/disable in
the slow path. The regular fastpath handles irq enable/disable
around calls to the slow path so we need to restore the proper
status before calling the page allocator from the slowpath.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

11 years agoMerge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzi...
Linus Torvalds [Mon, 17 Mar 2008 16:52:24 +0000]
Merge branch 'upstream-linus' of git://git./linux/kernel/git/jgarzik/libata-dev

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  ahci: Add Marvell 6121 SATA support
  pata_ali: use atapi_cmd_type() to determine cmd type instead of transfer size
  ahci: implement skip_host_reset parameter
  ahci: request all PCI BARs
  devres: implement pcim_iomap_regions_request_all()
  libata-acpi: improve dock event handling

11 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
Linus Torvalds [Mon, 17 Mar 2008 16:52:19 +0000]
Merge git://git./linux/kernel/git/rusty/linux-2.6-for-linus

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  virtio: fix race in enable_cb
  virtio: Enable netpoll interface for netconsole logging
  virtio: handle > 2 billion page balloon targets
  virtio: Fix sysfs bits to have proper block symlink
  virtio: Use spin_lock_irqsave/restore for virtio-pci

11 years agohfs_bnode_find() can fail, resulting in hfs_bnode_split() breakage
Al Viro [Sun, 16 Mar 2008 22:48:08 +0000]
hfs_bnode_find() can fail, resulting in hfs_bnode_split() breakage

oops and fs corruption; the latter can happen even on valid fs in case of oom.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

11 years agoahci: Add Marvell 6121 SATA support
Jose Alberto Reguero [Thu, 13 Mar 2008 22:22:24 +0000]
ahci: Add Marvell 6121 SATA support

Signed-off-by: Jose Alberto Reguero <jareguero@telefonica.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 years agopata_ali: use atapi_cmd_type() to determine cmd type instead of transfer size
Tejun Heo [Tue, 11 Mar 2008 02:35:00 +0000]
pata_ali: use atapi_cmd_type() to determine cmd type instead of transfer size

pata_ali was using qc->nbytes to determine whether a command is
data transfer type or not.  As now qc->nbytes can be extended by
padding and draining buffers, these tests are not useful anymore.

Use atapi_cmd_type() instead.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 years agoahci: implement skip_host_reset parameter
Tejun Heo [Mon, 10 Mar 2008 01:25:25 +0000]
ahci: implement skip_host_reset parameter

Under certain circumstances (SSP turned off by the BIOS) and for
debugging purposes, skipping global controller reset is helpful.  Add
a kernel parameter for it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 years agoahci: request all PCI BARs
Tejun Heo [Tue, 11 Mar 2008 10:52:31 +0000]
ahci: request all PCI BARs

ahci is often implemented with accompanying SFF compatible interface
and legacy IDE driver may attach to the legacy IO ports when the
controller is already claimed by ahci and vice-versa.  This patch
makes ahci use pcim_iomap_regions_request_all() so that all IO regions
are claimed on attach.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 years agodevres: implement pcim_iomap_regions_request_all()
Tejun Heo [Wed, 12 Mar 2008 06:26:34 +0000]
devres: implement pcim_iomap_regions_request_all()

Some drivers need to reserve all PCI BARs to prevent other drivers
misusing unoccupied BARs.  pcim_iomap_regions_request_all() requests
all BARs and iomap specified BARs.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 years agolibata-acpi: improve dock event handling
Tejun Heo [Wed, 12 Mar 2008 05:24:43 +0000]
libata-acpi: improve dock event handling

Improve ACPI hotplug handling such that dock event is handled properly.

* Register handlers for dock events.

* Directly detach device on EJECT_REQUEST instead of signaling hotplug
  event.  This prevents libata from accessing severed controller
  and/or device.

* While at it, use named constants for ACPI events and move uevent
  signaling inside host lock.

Original patch and testing by Holger Macht.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Holger Macht <hmacht@suse.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 years agovirtio: fix race in enable_cb
Christian Borntraeger [Fri, 14 Mar 2008 13:17:05 +0000]
virtio: fix race in enable_cb

There is a race in virtio_net, dealing with disabling/enabling the callback.
I saw the following oops:

kernel BUG at /space/kvm/drivers/virtio/virtio_ring.c:218!
illegal operation: 0001 [#1] SMP
Modules linked in: sunrpc dm_mod
CPU: 2 Not tainted 2.6.25-rc1zlive-host-10623-gd358142-dirty #99
Process swapper (pid: 0, task: 000000000f85a610, ksp: 000000000f873c60)
Krnl PSW : 0404300180000000 00000000002b81a6 (vring_disable_cb+0x16/0x20)
           R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:0 CC:3 PM:0 EA:3
Krnl GPRS: 0000000000000001 0000000000000001 0000000010005800 0000000000000001
           000000000f3a0900 000000000f85a610 0000000000000000 0000000000000000
           0000000000000000 000000000f870000 0000000000000000 0000000000001237
           000000000f3a0920 000000000010ff74 00000000002846f6 000000000fa0bcd8
Krnl Code: 00000000002b819a: a7110001           tmll    %r1,1
           00000000002b819e: a7840004           brc     8,2b81a6
           00000000002b81a2: a7f40001           brc     15,2b81a4
          >00000000002b81a6: a51b0001           oill    %r1,1
           00000000002b81aa: 40102000           sth     %r1,0(%r2)
           00000000002b81ae: 07fe               bcr     15,%r14
           00000000002b81b0: eb7ff0380024       stmg    %r7,%r15,56(%r15)
           00000000002b81b6: a7f13e00           tmll    %r15,15872
Call Trace:
([<000000000fa0bcd0>] 0xfa0bcd0)
 [<00000000002b8350>] vring_interrupt+0x5c/0x6c
 [<000000000010ab08>] do_extint+0xb8/0xf0
 [<0000000000110716>] ext_no_vtime+0x16/0x1a
 [<0000000000107e72>] cpu_idle+0x1c2/0x1e0

The problem can be triggered with a high amount of host->guest traffic.
I think its the following race:

poll says netif_rx_complete
poll calls enable_cb
enable_cb opens the interrupt mask
a new packet comes, an interrupt is triggered----\
enable_cb sees that there is more work           |
enable_cb disables the interrupt                 |
       .                                         V
       .                            interrupt is delivered
       .                            skb_recv_done does atomic napi test, ok
 some waiting                       disable_cb is called->check fails->bang!
       .
poll would do napi check
poll would do disable_cb

The fix is to let enable_cb not disable the interrupt again, but expect the
caller to do the cleanup if it returns false. In that case, the interrupt is
only disabled, if the napi test_set_bit was successful.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (cleaned up doco)

11 years agovirtio: Enable netpoll interface for netconsole logging
Amit Shah [Fri, 29 Feb 2008 10:54:50 +0000]
virtio: Enable netpoll interface for netconsole logging

Add a new poll_controller handler that the netpoll interface needs.

This enables netconsole logging from a kvm guest over the virtio
net interface.

Signed-off-by: Amit Shah <amitshah@gmx.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

11 years agovirtio: handle > 2 billion page balloon targets
Rusty Russell [Tue, 18 Mar 2008 03:58:15 +0000]
virtio: handle > 2 billion page balloon targets

If the host asks for a huge target towards_target() can overflow, and
we up oops as we try to release more pages than we have.  The simple
fix is to use a 64-bit value.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

11 years agovirtio: Fix sysfs bits to have proper block symlink
Jeremy Katz [Sun, 2 Mar 2008 22:00:15 +0000]
virtio: Fix sysfs bits to have proper block symlink

Fix up so that the virtio_blk devices in sysfs link correctly to their
block device.  This then allows them to be detected by hal, etc

Signed-off-by: Jeremy Katz <katzj@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

11 years agovirtio: Use spin_lock_irqsave/restore for virtio-pci
Anthony Liguori [Sun, 2 Mar 2008 22:37:48 +0000]
virtio: Use spin_lock_irqsave/restore for virtio-pci

virtio-pci acquires its spin lock in an interrupt context so it's necessary
to use spin_lock_irqsave/restore variants.  This patch fixes guest SMP when
using virtio devices in KVM.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

11 years agorelay: fix subbuf_splice_actor() adding too many pages
Jens Axboe [Mon, 17 Mar 2008 08:04:59 +0000]
relay: fix subbuf_splice_actor() adding too many pages

If subbuf_pages was larger than the max number of pages the pipe
buffer will hold, subbuf_splice_actor() would happily go beyond
the array size.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

11 years agoThe ps2esdi driver was marked as BROKEN more than two years ago due to being
Adrian Bunk [Thu, 6 Mar 2008 15:02:42 +0000]
The ps2esdi driver was marked as BROKEN more than two years ago due to being
no longer working for some time.

A driver that had been marked as BROKEN for such a long time seems to be
unlikely to be revived in the forseeable future.

But if anyone wants to ever revive this driver, the code is still present in
the older kernel releases.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Alan Cox <alan@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

11 years agodrm/ati_pcigart: fix the PCIGART to use drm_pci to allocate GART table.
Dave Airlie [Mon, 17 Mar 2008 00:24:24 +0000]
drm/ati_pcigart: fix the PCIGART to use drm_pci to allocate GART table.

This fixes a problem on 64-bit with 4GB with ATI RS690 chipsets. It
makes sure the pcigart table is allocated in coherent memory for DMA operations.

Signed-off-by: Dave Airlie <airlied@redhat.com>

11 years agodrm/radeon: fixup RV550 chip family
Alex Deucher [Mon, 17 Mar 2008 00:22:12 +0000]
drm/radeon: fixup RV550 chip family

This fixes up the RV550 chips which are based on RV515, not RV530.
It also adds another RS690 PCI ID.

Signed-off-by: Dave Airlie <airlied@redhat.com>

11 years agodrm/via: attempt again to stabilise the AGP DMA command submission.
Thomas Hellstrom [Mon, 17 Mar 2008 00:07:20 +0000]
drm/via: attempt again to stabilise the AGP DMA command submission.

It's worth remembering that all new bright ideas on how to make this command reader work properly and according to docs will probably fail :( Bring in some old code.

Also allow a larger SG-DMA download stride, and remove unnecessary waits for
command regulators pauses.

Signed-off-by: Dave Airlie <airlied@redhat.com>

11 years agodrm: Fix race that can lockup the kernel
Mike Isely [Thu, 13 Mar 2008 20:30:35 +0000]
drm: Fix race that can lockup the kernel

The i915_vblank_swap() function schedules an automatic buffer swap
upon receipt of the vertical sync interrupt.  Such an operation is
lengthy so it can't be allowed to happen in normal interrupt context,
thus the DRM implements this by scheduling the work in a kernel
softirq-scheduled tasklet.  In order for the buffer swap to work
safely, the DRM's central lock must be taken, via a call to
drm_lock_take() located in drivers/char/drm/drm_irq.c within the
function drm_locked_tasklet_func().  The lock-taking logic uses a
non-interrupt-blocking spinlock to implement the manipulations needed
to take the lock.  This semantic would be safe if all attempts to use
the spinlock only happen from process context.  However this buffer
swap happens from softirq context which is really a form of interrupt
context.  Thus we have an unsafe situation, in that
drm_locked_tasklet_func() can block on a spinlock already taken by a
thread in process context which will never get scheduled again because
of the blocked softirq tasklet.  This wedges the kernel hard.

To trigger this bug, run a dual-head cloned mode configuration which
uses the i915 drm, then execute an opengl application which
synchronizes buffer swaps against the vertical sync interrupt.  In my
testing, a lockup always results after running anywhere from 5 minutes
to an hour and a half.  I believe dual-head is needed to really
trigger the problem because then the vertical sync interrupt handling
is no longer predictable (due to being interrupt-sourced from two
different heads running at different speeds).  This raises the
probability of the tasklet trying to run while the userspace DRI is
doing things to the GPU (and manipulating the DRM lock).

The fix is to change the relevant spinlock semantics to be the
interrupt-blocking form.  After this change I am no longer able to
trigger the lockup; the longest test run so far was 20 hours (test
stopped after that point).

Note: I have examined the places where this spinlock is being
employed; all are reasonably short bounded sequences and should be
suitable for interrupts being blocked without impacting overall kernel
interrupt response latency.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

11 years agoLinux 2.6.25-rc6
Linus Torvalds [Sun, 16 Mar 2008 23:32:14 +0000]
Linux 2.6.25-rc6

11 years agoMerge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6
Linus Torvalds [Sun, 16 Mar 2008 17:48:23 +0000]
Merge branch 'master' of git://git./linux/kernel/git/kyle/parisc-2.6

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6:
  [PARISC] make ptr_to_pide() static
  [PARISC] head.S: section mismatch fixes
  [PARISC] add back Crestone Peak cpu
  [PARISC] futex: special case cmpxchg NULL in kernel space
  [PARISC] clean up show_stack
  [PARISC] add pa8900 CPUs to hardware inventory
  [PARISC] clean up include/asm-parisc/elf.h
  [PARISC] move defconfig to arch/parisc/configs/
  [PARISC] add back AD1889 MAINTAINERS entry
  [PARISC] pdc_console: fix bizarre panic on boot
  [PARISC] dump_stack in show_regs
  [PARISC] pdc_stable: fix compile errors
  [PARISC] remove unused pdc_iodc_printf function
  [PARISC] bump __NR_syscalls
  [PARISC] unbreak pgalloc.h
  [PARISC] move VMALLOC_* definitions to fixmap.h
  [PARISC] wire up timerfd syscalls
  [PARISC] remove old timerfd syscall

11 years ago[PARISC] make ptr_to_pide() static
FUJITA Tomonori [Mon, 10 Mar 2008 11:43:24 +0000]
[PARISC] make ptr_to_pide() static

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

11 years ago[PARISC] head.S: section mismatch fixes
Helge Deller [Wed, 26 Dec 2007 17:07:01 +0000]
[PARISC] head.S: section mismatch fixes

- move boot_args[] into the init section
- move $global$ into the read_mostly section
- fix the following two section mismatches:
WARNING: vmlinux.o(.text+0x9c): Section mismatch: reference to .init.text:start_kernel (between '$pgt_fill_loop' and '$is_pa20')
WARNING: vmlinux.o(.text+0xa0): Section mismatch: reference to .init.text:start_kernel (between '$pgt_fill_loop' and '$is_pa20')

Signed-off-by: Helge Deller <deller@gmx.de>
SIgned-off-by: Kyle McMartin <kyle@mcmartin.ca>