From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752348AbaERH7q (ORCPT ); Sun, 18 May 2014 03:59:46 -0400 Received: from mail-ee0-f51.google.com ([74.125.83.51]:40228 "EHLO mail-ee0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752186AbaERH66 (ORCPT ); Sun, 18 May 2014 03:58:58 -0400 From: Manfred Spraul To: Andrew Morton Cc: LKML , Davidlohr Bueso , Michael Kerrisk , 1vier1@web.de, Manfred Spraul Subject: [PATCH 5/6] ipc/sem.c: Store which operation blocks in perform_atomic_semop() Date: Sun, 18 May 2014 09:58:36 +0200 Message-Id: <1400399917-17583-6-git-send-email-manfred@colorfullife.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1400399917-17583-5-git-send-email-manfred@colorfullife.com> References: <1400399917-17583-1-git-send-email-manfred@colorfullife.com> <1400399917-17583-2-git-send-email-manfred@colorfullife.com> <1400399917-17583-3-git-send-email-manfred@colorfullife.com> <1400399917-17583-4-git-send-email-manfred@colorfullife.com> <1400399917-17583-5-git-send-email-manfred@colorfullife.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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