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Peter Anvin" , Andrew Morton Subject: [PATCH v2 1/2] x86/percpu: Fix clang warning when dealing with unsigned types Date: Wed, 16 Oct 2024 21:23:51 +0300 Message-ID: <20241016182635.1156168-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.43.0.rc1.1336.g36b5255a03ac In-Reply-To: <20241016182635.1156168-1-andriy.shevchenko@linux.intel.com> References: <20241016182635.1156168-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: CF4B440003 X-Stat-Signature: c8rd3g8cigxz13977nk7tj588ac9ea6f X-HE-Tag: 1729103203-388596 X-HE-Meta: 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 wiGIKcmj A++e5H4poiy30t5xxuD0YMRSOs1u8nKd533ODN0PbmZAJez3/lFbbYY1hDVN4nkvkbTEtHK+OLvdnMHqw9u5GjRDt+5R+k3wXo2Gyl04zrzPnhcY8xdk1pqqXoZ/frbAs54osQ4fVomSfp1R/ZY96ZT5CX32+WQ5nqdVlyqjuYPbggXQAZtzVsEpplw8QRwRBg8Gle/1nKMRf1Lp9fnfRoQBxXw== 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: List-Subscribe: List-Unsubscribe: When percpu_add_op() is used with an unsigned argument, it prevents kernel builds with clang, `make W=1` and CONFIG_WERROR=y: net/ipv4/tcp_output.c:187:3: error: result of comparison of constant -1 with expression of type 'u8' (aka 'unsigned char') is always false [-Werror,-Wtautological-constant-out-of-range-compare] 187 | NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPACKCOMPRESSED, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 188 | tp->compressed_ack); | ~~~~~~~~~~~~~~~~~~~ ... arch/x86/include/asm/percpu.h:238:31: note: expanded from macro 'percpu_add_op' 238 | ((val) == 1 || (val) == -1)) ? \ | ~~~~~ ^ ~~ Fix this by casting -1 to the type of the parameter and then compare. Signed-off-by: Andy Shevchenko --- arch/x86/include/asm/percpu.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index c55a79d5feae..e525cd85f999 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -234,9 +234,10 @@ do { \ */ #define percpu_add_op(size, qual, var, val) \ do { \ - const int pao_ID__ = (__builtin_constant_p(val) && \ - ((val) == 1 || (val) == -1)) ? \ - (int)(val) : 0; \ + const int pao_ID__ = \ + (__builtin_constant_p(val) && \ + ((val) == 1 || \ + (val) == (typeof(val))-1)) ? (int)(val) : 0; \ \ if (0) { \ typeof(var) pao_tmp__; \ From patchwork Wed Oct 16 18:23:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 13838709 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 25C6AD2A538 for ; Wed, 16 Oct 2024 18:26:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A8F7C6B0092; Wed, 16 Oct 2024 14:26:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A3FF86B0093; Wed, 16 Oct 2024 14:26:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8BA5A6B0095; Wed, 16 Oct 2024 14:26:53 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 6897A6B0092 for ; Wed, 16 Oct 2024 14:26:53 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 59E81809CC for ; Wed, 16 Oct 2024 18:26:44 +0000 (UTC) X-FDA: 82680296412.25.8914CD1 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) by imf30.hostedemail.com (Postfix) with ESMTP id EF9978000A for ; Wed, 16 Oct 2024 18:26:32 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=D4n5QQZ9; spf=none (imf30.hostedemail.com: domain of andriy.shevchenko@linux.intel.com has no SPF policy when checking 198.175.65.13) smtp.mailfrom=andriy.shevchenko@linux.intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1729103066; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=BFWmm1zFQPGoNhdewA1gckU07KeiC+C6khDYCUXa1f8=; b=zktA2z7fSGqYAETz39b1L/kJOW5ZC9K6g7josECTpKi5jB2rWM3702vAwBt/Fk8i0BWZf5 4clkKc8sBRk9eEO7GahVYvZNwv9lbaeOI4rNt8cwy3P15RLUjZafkMjRMSK5dOr9+wCgOP pmJ2q7Wzw+N/S41j1NipV4RN5GSGYvc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1729103066; a=rsa-sha256; cv=none; b=znRwS8CwbAjLbJaH8wiHjXWsgQKDyt9cdA2xznfB2kSNCU7T3WiVUs3AnmRhuvey/g7ZwJ v+QVSfpr3OaaXSLYbTQ4kcS5GvxutUkqR/qwIN2/pGtO0/zdSlN4PNGqH/4M8qrd2FzUAG NakZ/eYXoGM0xTH7e+J/T264zHMHAHM= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=D4n5QQZ9; spf=none (imf30.hostedemail.com: domain of andriy.shevchenko@linux.intel.com has no SPF policy when checking 198.175.65.13) smtp.mailfrom=andriy.shevchenko@linux.intel.com; dmarc=pass (policy=none) header.from=intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729103211; x=1760639211; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=i+jlu5IJcAwS1nR30IqBmViiQ/7hLgqTK8ynQICvJdY=; b=D4n5QQZ9+zuCDtSp6qYH0RP7NjHCQMKHs9N3XUQEwC58vGDN64gI1EIl vYcvlwH4ZEFq2l3YRnaBdMu3UTqtw6+guMq+kqoQifbMFmYjahC2RoI6v 6DNHdgBKO8Ftt7ioHtgnSgckJ+ny8vQ7l5Aplz7vZFnklXLM+/1J5gn8R +eOB40ycQUDKmOb8hCd32+7GQLf/0/+iYcxJ6w29viFd36rYLmyIXTpAM fjzb2VIQbmBhyPcD1NgXoHJCPQVLI5pOgLJbdOnNEWMhNFpJmVPjos6zT m3kk3bzTJh2XXSrC5SEHQ5bZx3TpZSeATIzHmNdKvJ4DewlIRREJ7coAr g==; X-CSE-ConnectionGUID: RCe0HayuQN65HualL9HcDw== X-CSE-MsgGUID: f+j6G5r9RM+GdfppJydudQ== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="39686015" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="39686015" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2024 11:26:44 -0700 X-CSE-ConnectionGUID: qOkdTDljSWaCVjpBCK00fg== X-CSE-MsgGUID: Ogdlfdq1TzORnKxcVJdobw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,208,1725346800"; d="scan'208";a="78269525" Received: from black.fi.intel.com ([10.237.72.28]) by orviesa010.jf.intel.com with ESMTP; 16 Oct 2024 11:26:40 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 7CE681C4; Wed, 16 Oct 2024 21:26:38 +0300 (EEST) From: Andy Shevchenko To: Ingo Molnar , Uros Bizjak , Andy Shevchenko , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Dennis Zhou , Tejun Heo , Christoph Lameter , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton Subject: [PATCH v2 2/2] percpu: Add a test case for the specific 64-bit value addition Date: Wed, 16 Oct 2024 21:23:52 +0300 Message-ID: <20241016182635.1156168-3-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.43.0.rc1.1336.g36b5255a03ac In-Reply-To: <20241016182635.1156168-1-andriy.shevchenko@linux.intel.com> References: <20241016182635.1156168-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 X-Stat-Signature: tn3nqoqadrxp89rsrc6w6z7hunozno77 X-Rspamd-Queue-Id: EF9978000A X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1729103192-237595 X-HE-Meta: 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 K49Iu75e RgkmrwgcGIeSyNZ2I0+xPj9FZ+Q6uNxZ2NqIoLCrTJqRJDvTFzhgvcSfyjMLvzxO0cfpnbeOzuayPYTA+XoIFkJDscSHroZNqyB43cqEnQjEcteVEklgha+2dkNcXbOs+ceRJk3uIeXBj66jj1IImsN0mT55MBckSGGZ+kfqtMAQcVIk= 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: List-Subscribe: List-Unsubscribe: It might be a corner case when we add UINT_MAX as 64-bit unsigned value to the percpu variable as it's not the same as -1 (ULONG_LONG_MAX). Add a test case for that. Signed-off-by: Andy Shevchenko --- lib/percpu_test.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/lib/percpu_test.c b/lib/percpu_test.c index 4a3d70bbc1a0..ce7124b16dab 100644 --- a/lib/percpu_test.c +++ b/lib/percpu_test.c @@ -1,4 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-only +#include #include /* validate @native and @pcp counter values match @expected */ @@ -24,8 +25,9 @@ static int __init percpu_test_init(void) * +ul_one/-ul_one below would replace with inc/dec instructions. */ volatile unsigned int ui_one = 1; - long l = 0; + unsigned long long ull = 0; unsigned long ul = 0; + long l = 0; pr_info("percpu test start\n"); @@ -112,6 +114,13 @@ static int __init percpu_test_init(void) CHECK(ul, ulong_counter, -1); CHECK(ul, ulong_counter, ULONG_MAX); + ul = ull = 0; + __this_cpu_write(ulong_counter, 0); + + ul = ull += UINT_MAX; + __this_cpu_add(ulong_counter, ull); + CHECK(ul, ulong_counter, UINT_MAX); + ul = 3; __this_cpu_write(ulong_counter, 3);