kernel.git/fs/aio.c, branch linux-2.6.28.y

eventfd: remove fput() call from possible IRQ context

2009-03-23T21:55:24Z

commit 87c3a86e1c220121d0ced59d1a71e78ed9abc6dd upstream. Remove a source of fput() call from inside IRQ context. Myself, like Eric, wasn't able to reproduce an fput() call from IRQ context, but Jeff said he was able to, with the attached test program. Independently from this, the bug is conceptually there, so we might be better off fixing it. This patch adds an optimization similar to the one we already do on ->ki_filp, on ->ki_eventfd. Playing with ->f_count directly is not pretty in general, but the alternative here would be to add a brand new delayed fput() infrastructure, that I'm not sure is worth it. Signed-off-by: Davide Libenzi Cc: Benjamin LaHaise Cc: Trond Myklebust Cc: Eric Dumazet Signed-off-by: Jeff Moyer Cc: Zach Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

System call wrappers part 16

2009-01-18T18:43:56Z

commit 002c8976ee537724b20a5e179d9b349309438836 upstream. Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman

[PATCH] f_count may wrap around

2008-07-27T00:53:40Z

make it atomic_long_t; while we are at it, get rid of useless checks in affs, hfs and hpfs - ->open() always has it equal to 1, ->release() - to 0. Signed-off-by: Al Viro

kill PF_BORROWED_MM in favour of PF_KTHREAD

2008-07-25T17:53:39Z

Kill PF_BORROWED_MM. Change use_mm/unuse_mm to not play with ->flags, and do s/PF_BORROWED_MM/PF_KTHREAD/ for a couple of other users. No functional changes yet. But this allows us to do further fixes/cleanups. oom_kill/ptrace/etc often check "p->mm != NULL" to filter out the kthreads, this is wrong because of use_mm(). The problem with PF_BORROWED_MM is that we need task_lock() to avoid races. With this patch we can check PF_KTHREAD directly, or use a simple lockless helper: /* The result must not be dereferenced !!! */ struct mm_struct *__get_task_mm(struct task_struct *tsk) { if (tsk->flags & PF_KTHREAD) return NULL; return tsk->mm; } Note also ecard_task(). It runs with ->mm != NULL, but it's the kernel thread without PF_BORROWED_MM. Signed-off-by: Oleg Nesterov Cc: Roland McGrath Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

uml: activate_mm: remove the dead PF_BORROWED_MM check

2008-06-06T18:36:22Z

use_mm() was changed to use switch_mm() instead of activate_mm(), since then nobody calls (and nobody should call) activate_mm() with PF_BORROWED_MM bit set. As Jeff Dike pointed out, we can also remove the "old != new" check, it is always true. Signed-off-by: Oleg Nesterov Cc: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

debugobjects: add timer specific object debugging code

2008-04-30T15:29:53Z

Add calls to the generic object debugging infrastructure and provide fixup functions which allow to keep the system alive when recoverable problems have been detected by the object debugging core code. Signed-off-by: Thomas Gleixner Acked-by: Ingo Molnar Cc: Greg KH Cc: Randy Dunlap Cc: Kay Sievers Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aio: fix misleading comments

2008-04-29T15:06:29Z

The FIXME comments are inaccurate. The locking comment over lookup_ioctx() is wrong. Signed-off-by: Jeff Moyer Signed-off-by: Zach Brown Signed-off-by: Shen Feng Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Remove duplicated unlikely() in IS_ERR()

2008-04-29T15:06:25Z

Some drivers have duplicated unlikely() macros. IS_ERR() already has unlikely() in itself. This patch cleans up such pointless code. Signed-off-by: Hirofumi Nakagawa Acked-by: David S. Miller Acked-by: Jeff Garzik Cc: Paul Clements Cc: Richard Purdie Cc: Alessandro Zummo Cc: David Brownell Cc: James Bottomley Cc: Michael Halcrow Cc: Anton Altaparmakov Cc: Al Viro Cc: Carsten Otte Cc: Patrick McHardy Cc: Paul Mundt Cc: Jaroslav Kysela Cc: Takashi Iwai Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

fs/aio.c: make 3 functions static

2008-04-29T15:06:00Z

Make the following needlessly global functions static: - __put_ioctx() - lookup_ioctx() - io_submit_one() Signed-off-by: Adrian Bunk Cc: Zach Brown Cc: Benjamin LaHaise Cc: Badari Pulavarty Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

aio: io_getevents() should return if io_destroy() is invoked

2008-04-28T15:58:17Z

This patch wakes up a thread waiting in io_getevents if another thread destroys the context. This was tested using a small program that spawns a thread to wait in io_getevents while the parent thread destroys the io context and then waits for the getevents thread to exit. Without this patch, the program hangs indefinitely. With the patch, the program exits as expected. Signed-off-by: Jeff Moyer Cc: Zach Brown Cc: Christopher Smith Cc: Benjamin LaHaise Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds