Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758147AbZJLUoZ (ORCPT ); Mon, 12 Oct 2009 16:44:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757048AbZJLUoZ (ORCPT ); Mon, 12 Oct 2009 16:44:25 -0400 Received: from hera.kernel.org ([140.211.167.34]:48187 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757992AbZJLUoX (ORCPT ); Mon, 12 Oct 2009 16:44:23 -0400 Date: Mon, 12 Oct 2009 20:43:08 GMT From: tip-bot for Arjan van de Ven Cc: linux-kernel@vger.kernel.org, arjan@infradead.org, hpa@zytor.com, mingo@redhat.com, rostedt@goodmis.org, arjan@linux.intel.com, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, arjan@infradead.org, linux-kernel@vger.kernel.org, arjan@linux.intel.com, rostedt@goodmis.org, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <20091006070452.5e1fc119@infradead.org> References: <20091006070452.5e1fc119@infradead.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/asm] x86: Don't use the strict copy checks when branch profiling is in use Message-ID: Git-Commit-ID: ad8f4356af58f7ded6b4a5787c67c7cab51066b5 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Mon, 12 Oct 2009 20:43:08 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1782 Lines: 48 Commit-ID: ad8f4356af58f7ded6b4a5787c67c7cab51066b5 Gitweb: http://git.kernel.org/tip/ad8f4356af58f7ded6b4a5787c67c7cab51066b5 Author: Arjan van de Ven AuthorDate: Tue, 6 Oct 2009 07:04:52 -0700 Committer: Ingo Molnar CommitDate: Mon, 12 Oct 2009 22:29:51 +0200 x86: Don't use the strict copy checks when branch profiling is in use The branch profiling creates very complex code for each if statement, to the point that gcc has trouble even analyzing something as simple as if (count > 5) count = 5; This then means that causing an error on code that gcc cannot analyze for copy_from_user() and co is not very productive. This patch excludes the strict copy checks in the case of branch profiling being enabled. Signed-off-by: Arjan van de Ven Cc: Steven Rostedt LKML-Reference: <20091006070452.5e1fc119@infradead.org> Signed-off-by: Ingo Molnar --- arch/x86/Kconfig.debug | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 1bd2e36..fb772b6 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -289,7 +289,7 @@ config OPTIMIZE_INLINING config DEBUG_STRICT_USER_COPY_CHECKS bool "Strict copy size checks" - depends on DEBUG_KERNEL + depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING ---help--- Enabling this option turns a certain set of sanity checks for user copy operations into compile time failures. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/