Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752541Ab3HUQrD (ORCPT ); Wed, 21 Aug 2013 12:47:03 -0400 Received: from mail-wi0-f173.google.com ([209.85.212.173]:50602 "EHLO mail-wi0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752170Ab3HUQrB (ORCPT ); Wed, 21 Aug 2013 12:47:01 -0400 From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , "Paul E. McKenney" , John Stultz , Steven Rostedt , Don Zickus Subject: [RFC PATCH 4/6] seqlock: Add raw_seqbegin() for non-waiting readers Date: Wed, 21 Aug 2013 18:42:19 +0200 Message-Id: <1377103341-15235-5-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1377103341-15235-1-git-send-email-fweisbec@gmail.com> References: <1377103341-15235-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1385 Lines: 40 Add the seqlock version of raw_seqcount_begin() for readers that can't wait for writers to complete their update and who can live with seqlock read acquirement failure. Signed-off-by: Frederic Weisbecker Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Paul E. McKenney Cc: John Stultz Cc: Steven Rostedt Cc: Don Zickus --- include/linux/seqlock.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index 1829905..aa845de 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -203,6 +203,11 @@ static inline unsigned read_seqbegin(const seqlock_t *sl) return read_seqcount_begin(&sl->seqcount); } +static inline unsigned raw_seqbegin(const seqlock_t *sl) +{ + return raw_seqcount_begin(&sl->seqcount); +} + static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start) { return read_seqcount_retry(&sl->seqcount, start); -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/