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Manfred Spraul
c61284e991
The last change to improve the scalability moved the actual wake-up out of the section that is protected by spin_lock(sma->sem_perm.lock). This means that IN_WAKEUP can be in queue.status even when the spinlock is acquired by the current task. Thus the same loop that is performed when queue.status is read without the spinlock acquired must be performed when the spinlock is acquired. Thanks to [email protected] for noticing lack of the memory barrier. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16255 [[email protected]: clean up kerneldoc, checkpatch warning and whitespace] Signed-off-by: Manfred Spraul <[email protected]> Reported-by: Luca Tettamanti <[email protected]> Tested-by: Luca Tettamanti <[email protected]> Reported-by: Christoph Lameter <[email protected]> Cc: Maciej Rutecki <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>