From: Manfred Spraul <manfred@colorfullife.com>
Date: Thu, 22 May 2014 00:44:19 +0000 (+1000)
Subject: ipc/sem.c: store which operation blocks in perform_atomic_semop()
X-Git-Tag: next-20140530~2^2~7
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e7950b18a81621f518d45b04bb256ae4cf9893a5;p=karo-tx-linux.git

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>
---

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