tree 32bce71a3486a217a3b87b86ac55f9b69e75eff6
parent 4bb6657dd3a55ab507502d82dbee9db276602669
author Manfred Spraul <manfred@colorfullife.com> 1402090667 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1402096095 -0700

ipc/sem.c: bugfix for semctl(,,GETZCNT)

GETZCNT is supposed to return the number of threads that wait until a
semaphore value becomes 0.

The current implementation overlooks complex operations that contain
both wait-for-zero operation and operations that alter at least one
semaphore.

The patch fixes that.  It's intentionally copy&paste, this will be
cleaned up in the next patch.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>