From patchwork Mon Apr 25 15:35:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 102466 Delivered-To: patch@linaro.org Received: by 10.140.93.198 with SMTP id d64csp1106075qge; Mon, 25 Apr 2016 08:36:37 -0700 (PDT) X-Received: by 10.98.67.67 with SMTP id q64mr49967981pfa.44.1461598597019; Mon, 25 Apr 2016 08:36:37 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id q64si7296918pfb.1.2016.04.25.08.36.36; Mon, 25 Apr 2016 08:36:37 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-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 linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754913AbcDYPgR (ORCPT + 29 others); Mon, 25 Apr 2016 11:36:17 -0400 Received: from mout.kundenserver.de ([212.227.17.24]:54447 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754796AbcDYPgP (ORCPT ); Mon, 25 Apr 2016 11:36:15 -0400 Received: from wuerfel.lan. ([78.42.132.4]) by mrelayeu.kundenserver.de (mreue101) with ESMTPA (Nemesis) id 0Lucy0-1buUBQ1PlY-00zr6s; Mon, 25 Apr 2016 17:35:40 +0200 From: Arnd Bergmann To: Michal Marek Cc: linux-kbuild@vger.kernel.org, Peter Oberparleiter , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Arnd Bergmann Subject: [PATCH 3/5] gcov: disable for COMPILE_TEST Date: Mon, 25 Apr 2016 17:35:29 +0200 Message-Id: <1461598531-2190169-4-git-send-email-arnd@arndb.de> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1461598531-2190169-1-git-send-email-arnd@arndb.de> References: <1461598531-2190169-1-git-send-email-arnd@arndb.de> X-Provags-ID: V03:K0:PAXV0DbLyxSxYErHhXcBWd4LfsBOkIMoMsT5hdTyFn5U+4+UXQA 4wm+qH7xrQ9XJxGSq5Zvw5NZGb6GmU3NHzN+Zvqdc0r/jZCvKiJ2nh9fdER1vS+Mdl4gONu JTA7UlULItlqcDSrrbxCF1AElVE0rg/SvEF2smXK0Z17dqqgGiDg6VtGijFaQnsFmFDNmuJ 6T2rhjNMtRiLyvtldA30A== X-UI-Out-Filterresults: notjunk:1; V01:K0:UZaW+ZNUMAY=:lcrGPSlH9AlPPz+idcWUt8 5voHs3G2/BpYgDRX3GSmEsuyDtE1tKAB9iF4MQP9GELSsYiv0aseS0JixFuNzEFg2uaUwXEpz i4SZTCjZimrRmqSI7kBVzg5CN/9NnTp7TfBq3RPCUd87xcBaDuCb5Tk+FsYvZsw6M91yglY31 YYVOCKY6YZCrIMutW5/KJrZKgoLImihJp9RA8MmHwNOqqIWLnWEflbBNhG2YF0bRRV9FuQqXJ ltKbXCFXMP/kN1EXunuaiDmCeO5WnNzcBy9LFpZHTkhxl86cVa4kJc5UvhwOQQKuu0BFOR7i6 7hC+KEZor7BpJ9Y2o+SgH3S0uCqNYE5sr3KwGYrCNxtue+RfB7DyZyfKhm9UCGtZWumxKJUzj M0AssvM581UR4yXL+1EaAC4SVUpeUseDEdVa6sCOLSmYErzv7s2/Dx19YYeI/vMgZloXETooQ FlVPOvIsy8pIQflpAFWfe85LwEDTVP3B04F6QVSFRgkwwerILtiOcqNnbs0SrhMR+1ElUUYgW 5OV1bgHCCJ5RhGurXByhDWRtlIsA2Gese4WzHYSSflv+7GCmzc+FsISv4p+b1rjpJas5mFwt7 JATmHsOkosbbtO/Fwi0DS9RjM/I1aRUjQvSmGpwMOMFzekNOyZZGKX0y5yaugH7Fs4AxzbhWm Z/CXAYGCSj0FQGf05CfDV61d+rWaea+FLbuiKnzKK3FVXyaskvcSBt/FVwyOJwQPKHhw= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Enabling gcov is counterproductive to compile testing: it significantly increases the kernel image size, compile time, and it produces lots of false positive "may be used uninitialized" warnings as the result of missed optimizations. This is in line with how UBSAN_SANITIZE_ALL and PROFILE_ALL_BRANCHES work, both of which have similar problems. With an ARM allmodconfig kernel, I see the build time drop from 283 minutes CPU time to 225 minutes, and the vmlinux size drops from 43MB to 26MB. Signed-off-by: Arnd Bergmann Acked-by: Peter Oberparleiter --- kernel/gcov/Kconfig | 1 + 1 file changed, 1 insertion(+) -- 2.7.0 diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig index c92e44855ddd..1276aabaab55 100644 --- a/kernel/gcov/Kconfig +++ b/kernel/gcov/Kconfig @@ -37,6 +37,7 @@ config ARCH_HAS_GCOV_PROFILE_ALL config GCOV_PROFILE_ALL bool "Profile entire Kernel" + depends on !COMPILE_TEST depends on GCOV_KERNEL depends on ARCH_HAS_GCOV_PROFILE_ALL default n