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authorManfred Spraul <manfred@colorfullife.com>2014-06-06 14:37:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-06 16:08:15 -0700
commited247b7ca0d20b4528eec362f8435594818d7601 (patch)
tree1ad0072dbfabf441a1aa84b328229b8f09ea6cae /ipc
parentd198cd6d6d02d0a335af2deacb60816ebb4719d1 (diff)
downloadkernel-ed247b7ca0d20b4528eec362f8435594818d7601.tar.gz
ipc/sem.c: store which operation blocks in perform_atomic_semop()
Preparation for the next patch: In the slow-path of perform_atomic_semop(), store a pointer to the operation that caused the operation to block. 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>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/sem.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index b93b561842cd..d61362b31f1e 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -109,6 +109,7 @@ struct sem_queue {
int pid; /* process id of requesting process */
int status; /* completion status of operation */
struct sembuf *sops; /* array of pending operations */
+ struct sembuf *blocking; /* the operation that blocked */
int nsops; /* number of operations */
int alter; /* does *sops alter the array? */
};
@@ -642,6 +643,8 @@ out_of_range:
goto undo;
would_block:
+ q->blocking = sop;
+
if (sop->sem_flg & IPC_NOWAIT)
result = -EAGAIN;
else