From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750988AbdCNIW3 (ORCPT ); Tue, 14 Mar 2017 04:22:29 -0400 Received: from LGEAMRELO12.lge.com ([156.147.23.52]:32996 "EHLO lgeamrelo12.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750785AbdCNIW1 (ORCPT ); Tue, 14 Mar 2017 04:22:27 -0400 X-Original-SENDERIP: 156.147.1.126 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 165.244.249.23 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 10.177.222.33 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: , CC: , , , , , , , , , , Subject: [PATCH v6 03/15] lockdep: Change the meaning of check_prev_add()'s return value Date: Tue, 14 Mar 2017 17:18:50 +0900 Message-ID: <1489479542-27030-4-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1489479542-27030-1-git-send-email-byungchul.park@lge.com> References: <1489479542-27030-1-git-send-email-byungchul.park@lge.com> X-MIMETrack: Itemize by SMTP Server on LGEKRMHUB03/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2017/03/14 17:19:37, Serialize by Router on LGEKRMHUB03/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2017/03/14 17:19:38, Serialize complete at 2017/03/14 17:19:38 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Firstly, return 1 instead of 2 when 'prev -> next' dependency already exists. Since the value 2 is not referenced anywhere, just return 1 indicating success in this case. Secondly, return 2 instead of 1 when successfully added a lock_list entry with saving stack_trace. With that, a caller can decide whether to avoid redundant save_trace() on the caller site. Signed-off-by: Byungchul Park --- kernel/locking/lockdep.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index eb39474..4709110 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -1854,7 +1854,7 @@ static inline void inc_chains(void) if (entry->class == hlock_class(next)) { if (distance == 1) entry->distance = 1; - return 2; + return 1; } } @@ -1894,9 +1894,10 @@ static inline void inc_chains(void) print_lock_name(hlock_class(next)); printk(KERN_CONT "\n"); dump_stack(); - return graph_lock(); + if (!graph_lock()) + return 0; } - return 1; + return 2; } /* -- 1.9.1