From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1035CC43441 for ; Thu, 22 Nov 2018 10:16:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D2AD820684 for ; Thu, 22 Nov 2018 10:16:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D2AD820684 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2394085AbeKVUy5 (ORCPT ); Thu, 22 Nov 2018 15:54:57 -0500 Received: from terminus.zytor.com ([198.137.202.136]:37715 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388115AbeKVUy5 (ORCPT ); Thu, 22 Nov 2018 15:54:57 -0500 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id wAMAFdRW3744600 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 22 Nov 2018 02:15:39 -0800 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id wAMAFdjX3744597; Thu, 22 Nov 2018 02:15:39 -0800 Date: Thu, 22 Nov 2018 02:15:39 -0800 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Yafang Shao Message-ID: Cc: tglx@linutronix.de, linux-kernel@vger.kernel.org, dvlasenk@redhat.com, peterz@infradead.org, brgerst@gmail.com, luto@amacapital.net, hpa@zytor.com, mingo@kernel.org, laoar.shao@gmail.com, torvalds@linux-foundation.org, bp@alien8.de Reply-To: hpa@zytor.com, mingo@kernel.org, laoar.shao@gmail.com, bp@alien8.de, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, dvlasenk@redhat.com, peterz@infradead.org, luto@amacapital.net, brgerst@gmail.com In-Reply-To: <1542798734-12532-1-git-send-email-laoar.shao@gmail.com> References: <1542798734-12532-1-git-send-email-laoar.shao@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/cleanups] x86/process: Avoid unnecessary NULL check in get_wchan() Git-Commit-ID: c382986fe178d02abdfcd6f4e7b9783c2922872c X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: c382986fe178d02abdfcd6f4e7b9783c2922872c Gitweb: https://git.kernel.org/tip/c382986fe178d02abdfcd6f4e7b9783c2922872c Author: Yafang Shao AuthorDate: Wed, 21 Nov 2018 19:12:14 +0800 Committer: Ingo Molnar CommitDate: Thu, 22 Nov 2018 10:07:21 +0100 x86/process: Avoid unnecessary NULL check in get_wchan() Task 'p' is always guaranteed to be non-NULL, because the only call sites are in fs/proc/ which all guarantee a non-NULL task pointer. [ mingo: Improved the changelog. ] Signed-off-by: Yafang Shao Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1542798734-12532-1-git-send-email-laoar.shao@gmail.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/process.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 8a33d4ad9661..b7cb5348f37f 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -733,7 +733,7 @@ unsigned long get_wchan(struct task_struct *p) unsigned long start, bottom, top, sp, fp, ip, ret = 0; int count = 0; - if (!p || p == current || p->state == TASK_RUNNING) + if (p == current || p->state == TASK_RUNNING) return 0; if (!try_get_task_stack(p))