From patchwork Sat Oct 8 09:39:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: XU pengfei X-Patchwork-Id: 13001730 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC421C433FE for ; Sat, 8 Oct 2022 09:40:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 68CC46B0073; Sat, 8 Oct 2022 05:40:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 615E58E0002; Sat, 8 Oct 2022 05:40:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4B6958E0001; Sat, 8 Oct 2022 05:40:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 347256B0073 for ; Sat, 8 Oct 2022 05:40:19 -0400 (EDT) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 0D3E3C0B9B for ; Sat, 8 Oct 2022 09:40:19 +0000 (UTC) X-FDA: 79997286558.04.4DFE5B3 Received: from mail.nfschina.com (unknown [124.16.136.209]) by imf09.hostedemail.com (Postfix) with ESMTP id 9CE5014000B for ; Sat, 8 Oct 2022 09:40:17 +0000 (UTC) Received: from localhost (unknown [127.0.0.1]) by mail.nfschina.com (Postfix) with ESMTP id 3BB601E80D72; Sat, 8 Oct 2022 17:34:27 +0800 (CST) X-Virus-Scanned: amavisd-new at test.com Received: from mail.nfschina.com ([127.0.0.1]) by localhost (mail.nfschina.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bxIa5yYX8fkl; Sat, 8 Oct 2022 17:34:24 +0800 (CST) Received: from localhost.localdomain.localdomain (unknown [219.141.250.2]) (Authenticated sender: xupengfei@nfschina.com) by mail.nfschina.com (Postfix) with ESMTPA id 724261E80D4D; Sat, 8 Oct 2022 17:34:24 +0800 (CST) From: XU pengfei To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, XU pengfei Subject: [PATCH 1/1] mm/mmap_lock: Remove unnecessary 'NULL' values from Pointer Date: Sat, 8 Oct 2022 17:39:43 +0800 Message-Id: <20221008093942.3982-1-xupengfei@nfschina.com> X-Mailer: git-send-email 2.18.2 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1665222018; a=rsa-sha256; cv=none; b=0P6gwn7+8tpZe4U8b6kh6UGmBabC3II75iyelitaLjEqa+IYCZrGnNUG3Iu3d9K1vkrIPX wkXsIRhbkvJolzwcMSBZZaK7H5anMbbqegHFfbebv4lrf+4NXqeI4qXnqu1b8tyZYm6JyG i1mZjSsHrMiq3Sf/mpBGQSW0UGbOBqU= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=none; dmarc=none; spf=none (imf09.hostedemail.com: domain of xupengfei@nfschina.com has no SPF policy when checking 124.16.136.209) smtp.mailfrom=xupengfei@nfschina.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1665222018; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=aWbW0uOsjmE39MOsDlIjnovWUQyT5wqji6Zev5pJqi4=; b=ahou1va7IsIUV3e2LDnYO7gEUT7d+2XKeBwYW88eJQ+bwHBwKDplGjAU7scqYtDxfMh/OE fX3QP46mc2OTGUt0ymQAkZZz99BrmgE57w0cZBMVEa30EgQwgusB9oAfdrgwM10eWeulqV xc/asCmCDRKA7rhOibCoxLoXC5GyuxQ= X-Stat-Signature: w7ng9gmjprpdc1834ah9mkfxof5xps9t X-Rspamd-Queue-Id: 9CE5014000B Authentication-Results: imf09.hostedemail.com; dkim=none; dmarc=none; spf=none (imf09.hostedemail.com: domain of xupengfei@nfschina.com has no SPF policy when checking 124.16.136.209) smtp.mailfrom=xupengfei@nfschina.com X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1665222017-700954 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Pointer variables allocate memory first, and then judge. There is no need to initialize the assignment. Signed-off-by: XU pengfei --- mm/mmap_lock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c index 1854850b4b89..65a57731aa15 100644 --- a/mm/mmap_lock.c +++ b/mm/mmap_lock.c @@ -198,7 +198,7 @@ void trace_mmap_lock_unreg(void) */ static const char *get_mm_memcg_path(struct mm_struct *mm) { - char *buf = NULL; + char *buf; struct mem_cgroup *memcg = get_mem_cgroup_from_mm(mm); if (memcg == NULL)