signal: Distinguish between kernel_siginfo and siginfo
Linus recently observed that if we did not worry about the padding
member in struct siginfo it is only about 48 bytes, and 48 bytes is
much nicer than 128 bytes for allocating on the stack and copying
around in the kernel.
The obvious thing of only adding the padding when userspace is
including siginfo.h won't work as there are sigframe definitions in
the kernel that embed struct siginfo.
So split siginfo in two; kernel_siginfo and siginfo. Keeping the
traditional name for the userspace definition. While the version that
is used internally to the kernel and ultimately will not be padded to
128 bytes is called kernel_siginfo.
The definition of struct kernel_siginfo I have put in include/signal_types.h
A set of buildtime checks has been added to verify the two structures have
the same field offsets.
To make it easy to verify the change kernel_siginfo retains the same
size as siginfo. The reduction in size comes in a following change.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 4fcd149..757afc7 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -79,7 +79,7 @@
* Copied from copy_siginfo_to_user() in kernel/signal.c
*/
static int signalfd_copyinfo(struct signalfd_siginfo __user *uinfo,
- siginfo_t const *kinfo)
+ kernel_siginfo_t const *kinfo)
{
struct signalfd_siginfo new;
@@ -163,7 +163,7 @@
return sizeof(*uinfo);
}
-static ssize_t signalfd_dequeue(struct signalfd_ctx *ctx, siginfo_t *info,
+static ssize_t signalfd_dequeue(struct signalfd_ctx *ctx, kernel_siginfo_t *info,
int nonblock)
{
ssize_t ret;
@@ -215,7 +215,7 @@
struct signalfd_siginfo __user *siginfo;
int nonblock = file->f_flags & O_NONBLOCK;
ssize_t ret, total = 0;
- siginfo_t info;
+ kernel_siginfo_t info;
count /= sizeof(struct signalfd_siginfo);
if (!count)