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=-10.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 12831C43441 for ; Mon, 26 Nov 2018 10:56:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CDE9B2146F for ; Mon, 26 Nov 2018 10:56:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="WDynd9EN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDE9B2146F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org 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 S1728577AbeKZVui (ORCPT ); Mon, 26 Nov 2018 16:50:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:59870 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726176AbeKZVuh (ORCPT ); Mon, 26 Nov 2018 16:50:37 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6E2792147D; Mon, 26 Nov 2018 10:56:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1543229813; bh=WmOUakZqihvrHPfSu0zVXmuj8A2jH6j83V3bT/rdCZw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WDynd9ENBDLKc6wTjOVXv5jm7HF/YuSncZWoNmo7gPo/h+W+UVIfJJqfS7vD18tf/ r+g1u+3Tc5OoJcJ7a9zzRy0Vqx6UGX/WxYPu8dOVW6pg2XJEqmh7rjnODb7M0f5hOl /fj8XDex8OJNfvKefirlZaOa/FE7483Wog417TUM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Prasad Sodagudi , Nathan Chancellor , Nick Desaulniers , Dennis Zhou , Sasha Levin Subject: [PATCH 4.9 12/46] arm64: percpu: Initialize ret in the default case Date: Mon, 26 Nov 2018 11:51:01 +0100 Message-Id: <20181126105047.312890705@linuxfoundation.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181126105045.447291262@linuxfoundation.org> References: <20181126105045.447291262@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit b5bb425871186303e6936fa2581521bdd1964a58 ] Clang warns that if the default case is taken, ret will be uninitialized. ./arch/arm64/include/asm/percpu.h:196:2: warning: variable 'ret' is used uninitialized whenever switch default is taken [-Wsometimes-uninitialized] default: ^~~~~~~ ./arch/arm64/include/asm/percpu.h:200:9: note: uninitialized use occurs here return ret; ^~~ ./arch/arm64/include/asm/percpu.h:157:19: note: initialize the variable 'ret' to silence this warning unsigned long ret, loop; ^ = 0 This warning appears several times while building the erofs filesystem. While it's not strictly wrong, the BUILD_BUG will prevent this from becoming a true problem. Initialize ret to 0 in the default case right before the BUILD_BUG to silence all of these warnings. Reported-by: Prasad Sodagudi Signed-off-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Signed-off-by: Dennis Zhou Signed-off-by: Sasha Levin --- arch/arm64/include/asm/percpu.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h index 0d551576eb57..4724b8f0b625 100644 --- a/arch/arm64/include/asm/percpu.h +++ b/arch/arm64/include/asm/percpu.h @@ -92,6 +92,7 @@ static inline unsigned long __percpu_##op(void *ptr, \ : [val] "Ir" (val)); \ break; \ default: \ + ret = 0; \ BUILD_BUG(); \ } \ \ @@ -121,6 +122,7 @@ static inline unsigned long __percpu_read(void *ptr, int size) ret = ACCESS_ONCE(*(u64 *)ptr); break; default: + ret = 0; BUILD_BUG(); } @@ -190,6 +192,7 @@ static inline unsigned long __percpu_xchg(void *ptr, unsigned long val, : [val] "r" (val)); break; default: + ret = 0; BUILD_BUG(); } -- 2.17.1