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=-5.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, USER_AGENT_MUTT 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 A5E39C43381 for ; Sat, 16 Mar 2019 21:01:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 73303218A1 for ; Sat, 16 Mar 2019 21:01:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ER51eV17" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727173AbfCPVBc (ORCPT ); Sat, 16 Mar 2019 17:01:32 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:45316 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727080AbfCPVBb (ORCPT ); Sat, 16 Mar 2019 17:01:31 -0400 Received: by mail-wr1-f65.google.com with SMTP id h99so12973121wrh.12 for ; Sat, 16 Mar 2019 14:01:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=r99XPAScrpX6udcCOHKSQBy7cEAtCOnECA2rqBxf/TY=; b=ER51eV17y1gzRvdFpEH3tkqq2Vf7oMRUNVXUTtU1jYxNGi74PCA/UUhZlYyMtW+GhK omKVFIjejk/TtsCNkqmOobU4D2/dqfdfSFKAsXlnjfl04k7iJstjovonfydntvZ7Yw3Z fULKoVCKrTjIvKaI2ITcHTJxMJSVZGxJiZjdA4p20nJuO0MIy6XZ8Vd1RhTEDTaWz36T vzlYPWtL48XlxpqpW8NGF+DCgXgjAktS16BAuMa0ygMSlQBxsZ9gKZWB1ZAEebq8Q/Kh dljTNH8euJG6E6JX6CAB9FLGL+vsvbwot1nxytm9S55uLhZxe5P8W/3NNgAM4J6/2DeW k6+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=r99XPAScrpX6udcCOHKSQBy7cEAtCOnECA2rqBxf/TY=; b=C09HxJ2VwjVjDEqTO/G1B2M+lGSUBWkiFXg61ZiYwlIV+lKH56Mda5kBoDOxLo5XxK 9NdtfCuZ9z9Uzfr7Z1OsJMdGeRGjL/L0N0LjOkf07j6ii7JYR8uJY/KookS3MjeKMOgo kD7HFFdwMtc/C3S7g2EInszJXeAastlK1hYOys2qn3ZYiTWnYv+7L+C14oGo98GoSifn KgQJTN0u9vTtivEjvXtVzfij04DO15iPb3rv+Dapxs0HQLN1+8642SZ1yvCNplwKWytv IFPcYzpTEI7wbJv4qR+If82dyJ1FzmZ6YZMQuU41lc9pQSMkVj8iM90T6tH5kr/UOwol tRfA== X-Gm-Message-State: APjAAAVjcKLNU2UK4fd7RcXK/PX6n8Ec2snd7Q05TuhUAWSfWqWJgh6i EgXAmACjsYEscu/wSNwfgw== X-Google-Smtp-Source: APXvYqxpBoID8CGQvX4wVqtOvnoDaIUUHADqzBJ8V4wPeYXcwI4rnfLRXHF4ObIaY1Mw5VXcFZOKFA== X-Received: by 2002:a5d:53c9:: with SMTP id a9mr702391wrw.59.1552770090305; Sat, 16 Mar 2019 14:01:30 -0700 (PDT) Received: from avx2 ([46.53.243.195]) by smtp.gmail.com with ESMTPSA id z10sm3918561wml.39.2019.03.16.14.01.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 16 Mar 2019 14:01:29 -0700 (PDT) Date: Sun, 17 Mar 2019 00:01:27 +0300 From: Alexey Dobriyan To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/4] x86, putuser: add ASM_CALL_CONSTRAINT Message-ID: <20190316210127.GA21830@avx2> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Clobber stack pointer given that assembly does CALL. Signed-off-by: Alexey Dobriyan --- arch/x86/include/asm/uaccess.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -176,7 +176,8 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) }) #define __put_user_x(size, x, ptr, __ret_pu) \ - asm volatile("call __put_user_" #size : "=a" (__ret_pu) \ + asm volatile("call __put_user_" #size \ + : "=a" (__ret_pu), ASM_CALL_CONSTRAINT \ : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")