linux-kernel - [PATCH 5/6] ipc/sem.c: Store which operation blocks in perform_atomic

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Date:	Sun, 18 May 2014 09:58:36 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Michael Kerrisk <mtk.manpages@...il.com>, 1vier1@....de,
	Manfred Spraul <manfred@...orfullife.com>
Subject: [PATCH 5/6] 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@...orfullife.com>
---
 ipc/sem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ipc/sem.c b/ipc/sem.c
index 7b1585d..8b5e976 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
-- 
1.9.0

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