From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932918AbcDYPhT (ORCPT ); Mon, 25 Apr 2016 11:37:19 -0400 Received: from mout.kundenserver.de ([212.227.17.13]:58134 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932844AbcDYPhQ (ORCPT ); Mon, 25 Apr 2016 11:37:16 -0400 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 1/5] Kbuild: change CC_OPTIMIZE_FOR_SIZE definition Date: Mon, 25 Apr 2016 17:35:27 +0200 Message-Id: <1461598531-2190169-2-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:/o9KGCtHPfAx7h8PjAjQcEGsSnwGZNVUZw97HwbBtqR1txdzSM/ gi8if3FhL/yWSfr/5spf3gnoyXIeplDuraYICgoWdKmAGmY4X0yLBEA5OkoX0VtTyWJgb+4 BRLUc1fS6TYOKGvc/qB9pqnU+8NU044DK0dPqYwzdEjsEQeT+jMnuNdVRxqMe2YZGbngyvK k/FqNZdmEvGcutSckOrVA== X-UI-Out-Filterresults: notjunk:1;V01:K0:Od22WQfSiGw=:IgLm6ZqdfosqbbW2nzsSwA 2IsNNmKe3jKVx0GHrtH5uQSybBFjndfqOtsWJzREzyTl6GVZvDRTnefq+LmVRaeOWNBiBTrEn 6HQa7DXULDCCKkwuIErKTlHykjcRAW3zLQtSUvLlX6UaNax3xnDvap1SuiMcpMMeN3L9ujrJ1 ssbsPJh2xSj9dyE/pzpxt7SCqnQsuE0AHA0AVTh6aUMXAblJ+7WByo3oI2cJwXoRQhBffBHeA 8bHmdsqbUPBm2/WPL6SQCXoWky2p1WmsvUFNdLk440nW14R3mM0YlwJ0C9KeOYnTGpEgRRgfL wWj0Xp5eehvQ3OmzmJ02WF1xGzCSFVDYc0agny7M9oaMIkLRs7ysNEnFvoWlE93csif19yw2J WA/r06rWS/c7uq6LEAbVizONYEHYElOK+XQbviLOnnwgM4ImtUv0xZLFt6TLnOYpfAuglFuOM Cac7i/oTHESJ2fuomJVlSE5rnn8s6q4/viOsmqDzw98VoJQMnmsNSIiMojnMAJt2chlZNssTr PJiPIPwjJ4HgY9JnXfixB0AzosXyVHmUdk3rT+nemMmt8fyYLn0HIuIXNyIgngJQIknxWI5+n k6zYkPNmU/IHop5hQNOpZ7cFOgrqe10VR8P74ILQQkCRllUzN8QJE+f/p0ztN5u8tI5bYFrEH H7/EG43Y3G29eOzOOs/DPdzdMZ20CPMNFAVtFT010QQzejbu0i7rT5d6UFYP2FuekLLI= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CC_OPTIMIZE_FOR_SIZE disables the often useful -Wmaybe-unused warning, because that causes a ridiculous amount of false positives when combined with -Os. This means a lot of warnings don't show up in testing by the developers that should see them with an 'allmodconfig' kernel that has CC_OPTIMIZE_FOR_SIZE enabled, but only later in randconfig builds that don't. This changes the Kconfig logic around CC_OPTIMIZE_FOR_SIZE to make it a 'choice' statement defaulting to CC_OPTIMIZE_FOR_PERFORMANCE that gets added for this purpose. The allmodconfig and allyesconfig kernels now default to -O2 with the maybe-unused warning enabled. Signed-off-by: Arnd Bergmann --- init/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/init/Kconfig b/init/Kconfig index 0c666408a8b6..d1b766bf60c1 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1284,6 +1284,17 @@ source "usr/Kconfig" endif +choice + prompt "Compiler optimization level" + default CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE + +config CC_OPTIMIZE_FOR_PERFORMANCE + bool "Optimize for performance" + help + This is the default optimization level for the kernel, building + with the "-O2" compiler flag for best performance and most + helpful compile-time warnings. + config CC_OPTIMIZE_FOR_SIZE bool "Optimize for size" help @@ -1292,6 +1303,8 @@ config CC_OPTIMIZE_FOR_SIZE If unsure, say N. +endchoice + config SYSCTL bool -- 2.7.0