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=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 4D432C2BB1D for ; Tue, 14 Apr 2020 20:15:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23A8B206E9 for ; Tue, 14 Apr 2020 20:15:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="reaaSqsD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2632873AbgDNUP3 (ORCPT ); Tue, 14 Apr 2020 16:15:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S2632823AbgDNUOp (ORCPT ); Tue, 14 Apr 2020 16:14:45 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39B0FC0610D6 for ; Tue, 14 Apr 2020 12:58:34 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id y84so772949pfb.7 for ; Tue, 14 Apr 2020 12:58:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=nxgycjZCK6bQ5TksD/KbhY7IXRvt1UDt7K60PjJOJP8=; b=reaaSqsDSb7MU9D89DGulCaGJQFBMZImkY9bkZDBFhJ0A+F/ibJ8fLskK6kTy1rqDY 1g1cek9xaVK1K1GzRJxEjDrqJeIWwK95rrQno/wsthv6vS5xAaH9Q5uw9P4kLN+7oSau uiI0LBMvubr6PFG/F4L/WN/My/uC5tDAK65ezHSrUjlQij5UZviKicZsDsjbPBrOqf5h pys2sLm1iAEx9CWzMeyOwd6XNa5p32LeZW5FEbeCkewBXS3MkSv3aaQ3x3gMS9ntoON5 CleMlNe/yR53PBjvsnGXc95UX/zpYDM5vaIqdLjk12vdFTsJuyEkuiHs3PMuPFuXaNUQ CWew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=nxgycjZCK6bQ5TksD/KbhY7IXRvt1UDt7K60PjJOJP8=; b=oTh9y3ztQd8n+tz7mqPGhBRFMugeo++rgyPuP4uMivM38JuAOoL5vG3kHu/gchOThN W51sPS0yAiGnShyt2cff4cSJ8x2J64SITjxQ+CwYuHrLLtTDbnurVuZtKJ7sfNdN57NA mCj7RjDaNZYAn59lnYEbQBMQQHfIbTtxykDwcJuj+UX5RQ0PvR9cbAhGHSqjbE8YoB/m YHC+LTXHzFrG/1NHxZmwLmqgXEt5mLRznHMtNMES2yYu3rqiKRhLTAqJFTfz1GUL9JwK +Q9i+XsN/cQ9ylQdhUGV5N4hOvZ1wN9jOvEBrW7bsNVtOzaoK6PJa63Ukz2KpEHShkV9 tY7Q== X-Gm-Message-State: AGi0PuaPSlcK1PFiUuaQ8iJGI6t6pGX8flrdBuRU53HP5exmytxUPRz6 dCWG3idTisM8gwSBKXF/q/Pu6QNY X-Google-Smtp-Source: APiQypKWHBdZ+kl0ZEvAN8m4Nb+5nzmzO63G3Uomz8LI1Ofdi8MQd3ATGzMC1oSg/4pqf3nJD2qQpYFM X-Received: by 2002:a17:90a:b702:: with SMTP id l2mr1993775pjr.22.1586894313617; Tue, 14 Apr 2020 12:58:33 -0700 (PDT) Date: Tue, 14 Apr 2020 12:56:38 -0700 Message-Id: <20200414195638.156123-1-gbiv@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.26.0.110.g2183baf09c-goog Subject: [PATCH] tools/build: tweak unused value workaround From: George Burgess IV To: akpm@linux-foundation.org Cc: ndesaulniers@google.com, linux-kernel@vger.kernel.org, George Burgess IV Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Clang has -Wself-assign enabled by default under -Wall, which always gets -Werror'ed on this file, causing sync-compare-and-swap to be disabled by default. The generally-accepted way to spell "this value is intentionally unused," is casting it to `void`. This is accepted by both GCC and Clang with -Wall enabled: https://godbolt.org/z/qqZ9r3 Signed-off-by: George Burgess IV --- tools/build/feature/test-sync-compare-and-swap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/build/feature/test-sync-compare-and-swap.c b/tools/build/feature/test-sync-compare-and-swap.c index 1e38d1930a97..3bc6b0768a53 100644 --- a/tools/build/feature/test-sync-compare-and-swap.c +++ b/tools/build/feature/test-sync-compare-and-swap.c @@ -7,7 +7,7 @@ int main(int argc, char *argv[]) { uint64_t old, new = argc; - argv = argv; + (void)argv; do { old = __sync_val_compare_and_swap(&x, 0, 0); } while (!__sync_bool_compare_and_swap(&x, old, new)); -- 2.26.0.110.g2183baf09c-goog