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    ipc/sem.c: move wake_up_process out of the spinlock section · 0a2b9d4c
    Manfred Spraul 提交于
    The wake-up part of semtimedop() consists out of two steps:
    
    - the right tasks must be identified.
    - they must be woken up.
    
    Right now, both steps run while the array spinlock is held.  This patch
    reorders the code and moves the actual wake_up_process() behind the point
    where the spinlock is dropped.
    
    The code also moves setting sem->sem_otime to one place: It does not make
    sense to set the last modify time multiple times.
    
    [akpm@linux-foundation.org: repair kerneldoc]
    [akpm@linux-foundation.org: fix uninitialised retval]
    Signed-off-by: NManfred Spraul <manfred@colorfullife.com>
    Cc: Chris Mason <chris.mason@oracle.com>
    Cc: Zach Brown <zach.brown@oracle.com>
    Cc: Jens Axboe <jens.axboe@oracle.com>
    Cc: Nick Piggin <npiggin@suse.de>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    0a2b9d4c
sem.c 39.6 KB