From patchwork Thu Jul 26 08:13:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 142941 Delivered-To: patch@linaro.org Received: by 2002:a2e:9754:0:0:0:0:0 with SMTP id f20-v6csp173185ljj; Thu, 26 Jul 2018 01:14:34 -0700 (PDT) X-Google-Smtp-Source: AAOMgpcDzPAVv3YKuPSJG0IcUSBgWZKaCBG7b+reOdYyi+hAFTHnsYd5f0OkYyLaRHzc+/Sf6t7/ X-Received: by 2002:a63:4306:: with SMTP id q6-v6mr932285pga.181.1532592874308; Thu, 26 Jul 2018 01:14:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1532592874; cv=none; d=google.com; s=arc-20160816; b=hylF96YHp6XJzWi/BDN+9fKszROnUCg7gZcl14k3Tjyz8KjondP1lBG6hI08NleIZl 2iWXs/qrWcBwbc83JK5rh/GoH+mpeXzvIATGorXtaXU2pxVTrLgpWq6voKENnx9Vw4f+ zHrzbC35TTiC0kCM1UYIAdDwPfZ66ZYA5XFmwci9w00PiBpoE1Pn7TIwWBH9/N81NT0v /qxHg4qJorFsHWj2WQGzuQd3Q8Q0WxHnBDbDriK4AFn1+qMYubIrfOu25vH+LQurfObe j8jjbNtHAKsFRGG3dEfrPLreIIsftThPhCped9N7ahHbsOolQl7kGx9eTEc2wTj/cAm3 BNDQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:subject:cc:to:from :arc-authentication-results; bh=V2uZu2vpkyQ+4GZ4ocE9+OYlxItLufhp/EzqjoYhpNY=; b=gNB25zaixUkSJMbMy2uIWosToll5dkBbywRT7K4IUjMmYHJzioffuBybqjco0uDGBP fBvhjZtiXmtZv5pHK65nYyclcSgd/HvggRWZqyq5+QMg0rab/kTI8C5z0RlguR7w/dKR v9zCxqN8lmYcQYzOu7KYykRjvVcggbbrLVzjlYap/dD35bPh24ixDG1YtA4FgVreAOsa AjRh4yjP7SydVYiODM1g/fuePcuV94F8qqHVTwJbe6pdavodJhvK/2TZJiQ3gJsuuwLG 9pKCpEuyio9yrRhu7K4y2f/1msXJuQea0GPkGV2U00gL86X+nOFOsuDZZS08Qh6G+1ef h99g== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=stable-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l184-v6si790427pge.257.2018.07.26.01.14.34; Thu, 26 Jul 2018 01:14:34 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=stable-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729158AbeGZJaO (ORCPT + 13 others); Thu, 26 Jul 2018 05:30:14 -0400 Received: from mout.kundenserver.de ([212.227.17.10]:33507 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729111AbeGZJaN (ORCPT ); Thu, 26 Jul 2018 05:30:13 -0400 Received: from wuerfel.lan ([109.193.40.16]) by mrelayeu.kundenserver.de (mreue105 [212.227.15.145]) with ESMTPA (Nemesis) id 0MTP5b-1fbHfA2uyF-00SOZS; Thu, 26 Jul 2018 10:14:27 +0200 From: Arnd Bergmann To: stable@vger.kernel.org Cc: gregkh@linuxfoundation.org, Arnd Bergmann , Michal Marek , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] [stable 4.14] turn off -Wattribute-alias Date: Thu, 26 Jul 2018 10:13:22 +0200 Message-Id: <20180726081358.3829157-1-arnd@arndb.de> X-Mailer: git-send-email 2.18.0 X-Provags-ID: V03:K1:fHpgrsexntLLsSc/URMhUQgv1faNscQ1vwHLBRJtJShiQHRy+L2 Gh1BqIbuYq0w5d4Vv/Ug+W8h8Durf0FqZRIvM2SYpEcxZCmYMPUNasYAUikwP0blSsOXoJY 9zTAL49sFheiElRoVX4A0qwJS3IliA9nZPXWeN4P6wgoeDc9mNtNz1n82nnlQRQIye9kCLK ynh8C8OHBhe1V9LIp++Jw== X-UI-Out-Filterresults: notjunk:1; V01:K0:bxKCtIWwhKM=:FwmdEtgtcQlhzMFuv/L2LF FKu2rPv53Pkn/HgKw7Y7gEoCibJ85fP1kpHBsG+VUCTxpP+WD9J85IBhjGFPweUApfOWEk9s3 S3jWzb9cqqdWwDNyAlb6SHG6HcsLTS0dnSmAlpRz8mEy0DwXH0QYchH+nVnR3UIiXZ+tvGjIG 13MepYcvD7Ah6Ln9RMMiF+MCs8j7Nfly5TADF+LjsbH+d/YVDr99OmK/4Y3dxB/TrDgCcpuDd cep1c0TsqcuA+l09FGTzclQ025QMkIIzufgoBYvBiakxaudz0YFyj2lIaxByaeK5i+/yT34N+ ECjqnRwqmOtzcvuXHwyjrp8gyAFGMIFl+OjzoSTPk1LhyxH9xgXN+QRXNFSp5hv0jpil0cs7Y DRFasYUCDpR8m9z39o3v1BSUgZYAn5dbenRvezvvZOF6cU9AAMMpw/kpp+nKUWpOIXCUoffp0 Hcpa2klWl6ZGWgksA2WAR7Ndo5gyr99GG7xpG4UeF768e7eV8TMhaw7D2satA8dsLWHAuav+q QagHNPZSXSRpz3cIF9UD88JTbNeo4iEi2mO/OaWrGlee/+3dTKJObxMzUmNZpR1pinVm6IozW bhkERfv/zRrOSv8X0mrXOIwcTtwybV+bzlTxDfHnE0iYW85Hpm5hRGA2W8BAKZpigo0rZ+OFQ f0FDfdjzCfQpK45dg71T/8Zaww3gRE9P1aOixRHsg5o+TaI3rrAEzK6XRjU1opxRMl/Y= Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Starting with gcc-8.1, we get a warning about all system call definitions, which use an alias between functions with incompatible prototypes, e.g.: In file included from ../mm/process_vm_access.c:19: ../include/linux/syscalls.h:211:18: warning: 'sys_process_vm_readv' alias between functions of incompatible types 'long int(pid_t, const struct iovec *, long unsigned int, const struct iovec *, long unsigned int, long unsigned int)' {aka 'long int(int, const struct iovec *, long unsigned int, const struct iovec *, long unsigned int, long unsigned int)'} and 'long int(long int, long int, long int, long int, long int, long int)' [-Wattribute-alias] asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \ ^~~ ../include/linux/syscalls.h:207:2: note: in expansion of macro '__SYSCALL_DEFINEx' __SYSCALL_DEFINEx(x, sname, __VA_ARGS__) ^~~~~~~~~~~~~~~~~ ../include/linux/syscalls.h:201:36: note: in expansion of macro 'SYSCALL_DEFINEx' #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__) ^~~~~~~~~~~~~~~ ../mm/process_vm_access.c:300:1: note: in expansion of macro 'SYSCALL_DEFINE6' SYSCALL_DEFINE6(process_vm_readv, pid_t, pid, const struct iovec __user *, lvec, ^~~~~~~~~~~~~~~ ../include/linux/syscalls.h:215:18: note: aliased declaration here asmlinkage long SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \ ^~~ ../include/linux/syscalls.h:207:2: note: in expansion of macro '__SYSCALL_DEFINEx' __SYSCALL_DEFINEx(x, sname, __VA_ARGS__) ^~~~~~~~~~~~~~~~~ ../include/linux/syscalls.h:201:36: note: in expansion of macro 'SYSCALL_DEFINEx' #define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__) ^~~~~~~~~~~~~~~ ../mm/process_vm_access.c:300:1: note: in expansion of macro 'SYSCALL_DEFINE6' SYSCALL_DEFINE6(process_vm_readv, pid_t, pid, const struct iovec __user *, lvec, This is really noisy and does not indicate a real problem. In the latest mainline kernel, this was addressed by commit bee20031772a ("disable -Wattribute-alias warning for SYSCALL_DEFINEx()"), which seems too invasive to backport. This takes a much simpler approach and just disables the warning across the kernel. Signed-off-by: Arnd Bergmann --- Makefile | 1 + 1 file changed, 1 insertion(+) -- 2.18.0 diff --git a/Makefile b/Makefile index a44d6b2adb76..91f9d2d56eac 100644 --- a/Makefile +++ b/Makefile @@ -642,6 +642,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context) +KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias) ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)