+config DEFCONFIG_LIST
+ string
+ depends on !UML
+ option defconfig_list
+ default "/lib/modules/$UNAME_RELEASE/.config"
+ default "/etc/kernel-config"
+ default "/boot/config-$UNAME_RELEASE"
+ default "arch/$ARCH/defconfig"
+
menu "Code maturity level options"
config EXPERIMENTAL
you say Y here, you will be offered the choice of using features or
drivers that are currently considered to be in the alpha-test phase.
-config CLEAN_COMPILE
- bool "Select only drivers expected to compile cleanly" if EXPERIMENTAL
- default y
- help
- Select this option if you don't even want to see the option
- to configure known-broken drivers.
-
- If unsure, say Y
-
config BROKEN
bool
- depends on !CLEAN_COMPILE
- default y
config BROKEN_ON_SMP
bool
config INIT_ENV_ARG_LIMIT
int
- default 32 if !USERMODE
- default 128 if USERMODE
+ default 32 if !UML
+ default 128 if UML
help
Maximum of each of the number of arguments and environment
variables passed to init from the kernel command line.
default y
help
This will try to automatically determine if the current tree is a
- release tree by looking for git tags that
- belong to the current top of tree revision.
+ release tree by looking for git tags that belong to the current
+ top of tree revision.
A string of the format -gxxxxxxxx will be added to the localversion
- if a git based tree is found. The string generated by this will be
+ if a git-based tree is found. The string generated by this will be
appended after any matching localversion* files, and after the value
- set in CONFIG_LOCALVERSION
+ set in CONFIG_LOCALVERSION.
+
+ (The actual string used here is the first eight characters produced
+ by running the command:
+
+ $ git rev-parse --verify HEAD
- Note: This requires Perl, and a git repository, but not necessarily
- the git or cogito tools to be installed.
+ which is done within the script "scripts/setlocalversion".)
config SWAP
bool "Support for paging of anonymous memory (swap)"
- depends on MMU
+ depends on MMU && BLOCK
default y
help
This option allows you to choose whether you want to have support
- for socalled swap devices or swap files in your kernel that are
+ for so called swap devices or swap files in your kernel that are
used to provide more virtual memory than the actual RAM present
in your computer. If unsure say Y.
section 6.4 of the Linux Programmer's Guide, available from
<http://www.tldp.org/guides.html>.
+config IPC_NS
+ bool "IPC Namespaces"
+ depends on SYSVIPC
+ default n
+ help
+ Support ipc namespaces. This allows containers, i.e. virtual
+ environments, to use ipc namespaces to provide different ipc
+ objects for different servers. If unsure, say N.
+
+config SYSVIPC_SYSCTL
+ bool
+ depends on SYSVIPC
+ depends on SYSCTL
+ default y
+
config POSIX_MQUEUE
bool "POSIX Message Queues"
depends on NET && EXPERIMENTAL
queues every message has a priority which decides about succession
of receiving it by a process. If you want to compile and run
programs written e.g. for Solaris with use of its POSIX message
- queues (functions mq_*) say Y here. To use this feature you will
- also need mqueue library, available from
- <http://www.mat.uni.torun.pl/~wrona/posix_ipc/>
+ queues (functions mq_*) say Y here.
POSIX message queues are visible as a filesystem called 'mqueue'
and can be mounted somewhere if you want to do filesystem
for processing it. A preliminary version of these tools is available
at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
-config SYSCTL
- bool "Sysctl support"
- ---help---
- The sysctl interface provides a means of dynamically changing
- certain kernel parameters and variables on the fly without requiring
- a recompile of the kernel or reboot of the system. The primary
- interface consists of a system call, but if you say Y to "/proc
- file system support", a tree of modifiable sysctl entries will be
- generated beneath the /proc/sys directory. They are explained in the
- files in <file:Documentation/sysctl/>. Note that enabling this
- option will enlarge the kernel by at least 8 KB.
-
- As it is generally a good thing, you should say Y here unless
- building a kernel for install/rescue disks or your system is very
- limited in memory.
+config TASKSTATS
+ bool "Export task/process statistics through netlink (EXPERIMENTAL)"
+ depends on NET
+ default n
+ help
+ Export selected statistics for tasks/processes through the
+ generic netlink interface. Unlike BSD process accounting, the
+ statistics are available during the lifetime of tasks/processes as
+ responses to commands. Like BSD accounting, they are sent to user
+ space on task exit.
+
+ Say N if unsure.
+
+config TASK_DELAY_ACCT
+ bool "Enable per-task delay accounting (EXPERIMENTAL)"
+ depends on TASKSTATS
+ help
+ Collect information on time spent by a task waiting for system
+ resources like cpu, synchronous block I/O completion and swapping
+ in pages. Such statistics can help in setting a task's priorities
+ relative to other tasks for cpu, io, rss limits etc.
+
+ Say N if unsure.
+
+config TASK_XACCT
+ bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
+ depends on TASKSTATS
+ help
+ Collect extended task accounting data and send the data
+ to userland for processing over the taskstats interface.
+
+ Say N if unsure.
+
+config TASK_IO_ACCOUNTING
+ bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
+ depends on TASK_XACCT
+ help
+ Collect information on the number of bytes of storage I/O which this
+ task has caused.
+
+ Say N if unsure.
+
+config UTS_NS
+ bool "UTS Namespaces"
+ default n
+ help
+ Support uts namespaces. This allows containers, i.e.
+ vservers, to use uts namespaces to provide different
+ uts info for different servers. If unsure, say N.
config AUDIT
bool "Auditing support"
depends on NET
- default y if SECURITY_SELINUX
help
Enable auditing infrastructure that can be used with another
kernel subsystem, such as SELinux (which requires this for
help
Enable low-overhead system-call auditing infrastructure that
can be used independently or with another kernel subsystem,
- such as SELinux.
+ such as SELinux. To use audit's filesystem watch feature, please
+ ensure that INOTIFY is configured.
config IKCONFIG
- bool "Kernel .config support"
+ tristate "Kernel .config support"
---help---
This option enables the complete Linux kernel ".config" file
contents to be saved in the kernel. It provides documentation
This option enables access to the kernel configuration file
through /proc/config.gz.
+config LOG_BUF_SHIFT
+ int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
+ range 12 21
+ default 17 if S390 || LOCKDEP
+ default 16 if X86_NUMAQ || IA64
+ default 15 if SMP
+ default 14
+ help
+ Select kernel log buffer size as a power of 2.
+ Defaults and Examples:
+ 17 => 128 KB for S/390
+ 16 => 64 KB for x86 NUMAQ or IA-64
+ 15 => 32 KB for SMP
+ 14 => 16 KB for uniprocessor
+ 13 => 8 KB
+ 12 => 4 KB
+
config CPUSETS
bool "Cpuset support"
depends on SMP
Say N if unsure.
-source "usr/Kconfig"
-
-config UID16
- bool "Enable 16-bit UID system calls" if EMBEDDED
- depends !ALPHA && !PPC && !PPC64 && !PARISC && !V850 && !ARCH_S390X
- depends !X86_64 || IA32_EMULATION
- depends !SPARC64 || SPARC32_COMPAT
+config SYSFS_DEPRECATED
+ bool "Create deprecated sysfs files"
default y
help
- This enables the legacy 16-bit UID syscall wrappers.
+ This option creates deprecated symlinks such as the
+ "device"-link, the <subsystem>:<name>-link, and the
+ "bus"-link. It may also add deprecated key in the
+ uevent environment.
+ None of these features or values should be used today, as
+ they export driver core implementation details to userspace
+ or export properties which can't be kept stable across kernel
+ releases.
+
+ If enabled, this option will also move any device structures
+ that belong to a class, back into the /sys/class hierarchy, in
+ order to support older versions of udev.
+
+ If you are using a distro that was released in 2006 or later,
+ it should be safe to say N here.
+
+config RELAY
+ bool "Kernel->user space relay support (formerly relayfs)"
+ help
+ This option enables support for relay interface support in
+ certain file systems (such as debugfs).
+ It is designed to provide an efficient mechanism for tools and
+ facilities to relay large amounts of data from kernel space to
+ user space.
+
+ If unsure, say N.
+
+config BLK_DEV_INITRD
+ bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
+ depends on BROKEN || !FRV
+ help
+ The initial RAM filesystem is a ramfs which is loaded by the
+ boot loader (loadlin or lilo) and that is mounted as root
+ before the normal boot procedure. It is typically used to
+ load modules needed to mount the "real" root file system,
+ etc. See <file:Documentation/initrd.txt> for details.
+
+ If RAM disk support (BLK_DEV_RAM) is also included, this
+ also enables initial RAM disk (initrd) support and adds
+ 15 Kbytes (more on some other architectures) to the kernel size.
+
+ If unsure say Y.
+
+if BLK_DEV_INITRD
+
+source "usr/Kconfig"
+
+endif
config CC_OPTIMIZE_FOR_SIZE
bool "Optimize for size (Look out for broken compilers!)"
If unsure, say N.
+config SYSCTL
+ bool
+
menuconfig EMBEDDED
bool "Configure standard kernel features (for small systems)"
help
environments which can tolerate a "non-standard" kernel.
Only use this if you really know what you are doing.
+config UID16
+ bool "Enable 16-bit UID system calls" if EMBEDDED
+ depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
+ default y
+ help
+ This enables the legacy 16-bit UID syscall wrappers.
+
+config SYSCTL_SYSCALL
+ bool "Sysctl syscall support" if EMBEDDED
+ default y
+ select SYSCTL
+ ---help---
+ sys_sysctl uses binary paths that have been found challenging
+ to properly maintain and use. The interface in /proc/sys
+ using paths with ascii names is now the primary path to this
+ information.
+
+ Almost nothing using the binary sysctl interface so if you are
+ trying to save some space it is probably safe to disable this,
+ making your kernel marginally smaller.
+
+ If unsure say Y here.
+
config KALLSYMS
- bool "Load all symbols for debugging/kksymoops" if EMBEDDED
+ bool "Load all symbols for debugging/ksymoops" if EMBEDDED
default y
help
Say Y here to let the kernel print out symbolic crash information and
option for embedded systems with no facilities for reporting errors.
Just say Y.
-config DOUBLEFAULT
- depends X86
- default y if X86
- bool "Enable doublefault exception handler" if EMBEDDED
- help
- This option allows trapping of rare doublefault exceptions that
- would otherwise cause a system to silently reboot. Disabling this
- option saves about 4k.
-
config ELF_CORE
default y
bool "Enable ELF core dumps" if EMBEDDED
config FUTEX
bool "Enable futex support" if EMBEDDED
default y
+ select RT_MUTEXES
help
Disabling this option will cause the kernel to be built without
support for "fast userspace mutexes". The resulting kernel may not
run glibc-based applications correctly.
+config ANON_INODES
+ bool "Enable anonymous inode source" if EMBEDDED
+ default y
+ help
+ Anonymous inode source for pseudo-files like epoll, signalfd,
+ timerfd and eventfd.
+
+ If unsure, say Y.
+
config EPOLL
bool "Enable eventpoll support" if EMBEDDED
default y
+ depends on ANON_INODES
help
Disabling this option will cause the kernel to be built without
support for epoll family of system calls.
+config SIGNALFD
+ bool "Enable signalfd() system call" if EMBEDDED
+ depends on ANON_INODES
+ default y
+ help
+ Enable the signalfd() system call that allows to receive signals
+ on a file descriptor.
+
+ If unsure, say Y.
+
+config TIMERFD
+ bool "Enable timerfd() system call" if EMBEDDED
+ depends on ANON_INODES
+ default y
+ help
+ Enable the timerfd() system call that allows to receive timer
+ events on a file descriptor.
+
+ If unsure, say Y.
+
+config EVENTFD
+ bool "Enable eventfd() system call" if EMBEDDED
+ depends on ANON_INODES
+ default y
+ help
+ Enable the eventfd() system call that allows to receive both
+ kernel notification (ie. KAIO) or userspace notifications.
+
+ If unsure, say Y.
+
config SHMEM
bool "Use full shmem filesystem" if EMBEDDED
default y
option replaces shmem and tmpfs with the much simpler ramfs code,
which may be appropriate on small systems without swap.
-config CC_ALIGN_FUNCTIONS
- int "Function alignment" if EMBEDDED
- default 0
+config VM_EVENT_COUNTERS
+ default y
+ bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
help
- Align the start of functions to the next power-of-two greater than n,
- skipping up to n bytes. For instance, 32 aligns functions
- to the next 32-byte boundary, but 24 would align to the next
- 32-byte boundary only if this can be done by skipping 23 bytes or less.
- Zero means use compiler's default.
+ VM event counters are needed for event counts to be shown.
+ This option allows the disabling of the VM event counters
+ on EMBEDDED systems. /proc/vmstat will only show page counts
+ if VM event counters are disabled.
-config CC_ALIGN_LABELS
- int "Label alignment" if EMBEDDED
- default 0
+config SLUB_DEBUG
+ default y
+ bool "Enable SLUB debugging support" if EMBEDDED
+ depends on SLUB
help
- Align all branch targets to a power-of-two boundary, skipping
- up to n bytes like ALIGN_FUNCTIONS. This option can easily
- make code slower, because it must insert dummy operations for
- when the branch target is reached in the usual flow of the code.
- Zero means use compiler's default.
+ SLUB has extensive debug support features. Disabling these can
+ result in significant savings in code size. This also disables
+ SLUB sysfs support. /sys/slab will not exist and there will be
+ no support for cache validation etc.
-config CC_ALIGN_LOOPS
- int "Loop alignment" if EMBEDDED
- default 0
+choice
+ prompt "Choose SLAB allocator"
+ default SLAB
help
- Align loops to a power-of-two boundary, skipping up to n bytes.
- Zero means use compiler's default.
+ This option allows to select a slab allocator.
-config CC_ALIGN_JUMPS
- int "Jump alignment" if EMBEDDED
- default 0
+config SLAB
+ bool "SLAB"
help
- Align branch targets to a power-of-two boundary, for branch
- targets where the targets can only be reached by jumping,
- skipping up to n bytes like ALIGN_FUNCTIONS. In this case,
- no dummy operations need be executed.
- Zero means use compiler's default.
+ The regular slab allocator that is established and known to work
+ well in all environments. It organizes cache hot objects in
+ per cpu and per node queues. SLAB is the default choice for
+ a slab allocator.
-config SLAB
- default y
- bool "Use full SLAB allocator" if EMBEDDED
+config SLUB
+ bool "SLUB (Unqueued Allocator)"
help
- Disabling this replaces the advanced SLAB allocator and
- kmalloc support with the drastically simpler SLOB allocator.
- SLOB is more space efficient but does not scale well and is
- more susceptible to fragmentation.
+ SLUB is a slab allocator that minimizes cache line usage
+ instead of managing queues of cached objects (SLAB approach).
+ Per cpu caching is realized using slabs of objects instead
+ of queues of objects. SLUB can use memory efficiently
+ and has enhanced diagnostics.
+
+config SLOB
+ depends on EMBEDDED && !SPARSEMEM
+ bool "SLOB (Simple Allocator)"
+ help
+ SLOB replaces the SLAB allocator with a drastically simpler
+ allocator. SLOB is more space efficient than SLAB but does not
+ scale well (single lock for all operations) and is also highly
+ susceptible to fragmentation. SLUB can accomplish a higher object
+ density. It is usually better to use SLUB instead of SLOB.
+
+endchoice
endmenu # General setup
+config RT_MUTEXES
+ boolean
+ select PLIST
+
config TINY_SHMEM
default !SHMEM
bool
default 0 if BASE_FULL
default 1 if !BASE_FULL
-config SLOB
- default !SLAB
- bool
-
menu "Loadable module support"
config MODULES
rmmod). This is mainly for kernel developers and desperate users.
If unsure, say N.
-config OBSOLETE_MODPARM
- bool
- default y
- depends on MODULES
- help
- You need this option to use module parameters on modules which
- have not been converted to the new module parameter system yet.
- If unsure, say Y.
-
config MODVERSIONS
bool "Module versioning support"
depends on MODULES
Code Review / linux-2.6.git / blobdiff