Eric Lee / smarc-fsl-linux-kernel

24 Mar, 2013

1 commit

  • 84759c6d1   Revert "rw_semaphore: remove up/down_read_non_owner" ... Browse Code »

    This reverts commit 11b80f459adaf91a712f95e7734a17655a36bf30.

    Bcache needs rw semaphores for cache coherency in writeback mode -
    writes have to take a read lock on a per cache device rw sem, and
    release it when the bio completes.

    But since this is for bios it's naturally not in the context of the
    process that originally took the lock.

    Signed-off-by: Kent Overstreet
    CC: Christoph Hellwig
    CC: David Howells

    Kent Overstreet
     

12 Jan, 2013

1 commit

  • 1b963c81b   lockdep, rwsem: provide down_write_nest_lock() ... Browse Code »

    down_write_nest_lock() provides a means to annotate locking scenario
    where an outer lock is guaranteed to serialize the order nested locks
    are being acquired.

    This is analogoue to already existing mutex_lock_nest_lock() and
    spin_lock_nest_lock().

    Signed-off-by: Jiri Kosina
    Cc: Rik van Riel
    Cc: Ingo Molnar
    Cc: Peter Zijlstra
    Cc: Mel Gorman
    Tested-by: Sedat Dilek
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jiri Kosina
     

29 Mar, 2012

1 commit

31 Oct, 2011

1 commit

  • 9984de1a5   kernel: Map most files to use export.h instead of module.h ... Browse Code »

    The changed files were only including linux/module.h for the
    EXPORT_SYMBOL infrastructure, and nothing else. Revector them
    onto the isolated export header for faster compile times.

    Nothing to see here but a whole lot of instances of:

    -#include
    +#include

    This commit is only changing the kernel dir; next targets
    will probably be mm, fs, the arch dirs, etc.

    Signed-off-by: Paul Gortmaker

    Paul Gortmaker
     

27 Jul, 2011

1 commit

  • 60063497a   atomic: use <linux/atomic.h> ... Browse Code »

    This allows us to move duplicated code in
    (atomic_inc_not_zero() for now) to

    Signed-off-by: Arun Sharma
    Reviewed-by: Eric Dumazet
    Cc: Ingo Molnar
    Cc: David Miller
    Cc: Eric Dumazet
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arun Sharma
     

21 Jul, 2011

1 commit

18 Dec, 2007

1 commit

  • c7af77b58   sched: mark rwsem functions as __sched for wchan/profiling ... Browse Code »

    This following commit

    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=fdf8cb0909b531f9ae8f9b9d7e4eb35ba3505f07

    un-inlined a low-level rwsem function, but did not mark it as __sched.
    The result is that it now shows up as thread wchan (which also affects
    /proc/profile stats). The following simple patch fixes this by properly
    marking rwsem_down_failed_common() as a __sched function.

    Also in this patch, which is up for discussion, marks down_read() and
    down_write() proper as __sched. For profiling, it is pretty much
    useless to know that a semaphore is beig help - it is necessary to know
    _which_ one. By going up another frame on the stack, the information
    becomes much more useful.

    In summary, the below change to lib/rwsem.c should be applied; the
    changes to kernel/rwsem.c could be applied if other kernel hackers agree
    with my proposal that down_read()/down_write() in the profile is not
    enough.

    [ akpm@linux-foundation.org: build fix ]

    Signed-off-by: Livio Soares
    Signed-off-by: Andrew Morton
    Signed-off-by: Ingo Molnar

    Livio Soares
     

20 Jul, 2007

1 commit

09 May, 2007

1 commit

  • 428e6ce02   Lockdep treats down_write_trylock like regular down_write ... Browse Code »

    This causes constructions like

    down_write(&mm1->mmap_sem);
    if (down_write_trylock(&mm2->mmap_sem)) {
    ...
    up_write(&mm2->mmap_sem);
    }
    up_write(&mm1->mmap_sem);

    generate a lockdep warning about circular locking dependence.

    Call rwsem_acquire() with trylock set to 1.

    Cc: Ingo Molnar
    Cc: Arjan van de Ven
    Cc: Peter Zijlstra
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Pavel Emelianov
     

04 Jul, 2006

2 commits