From: Arjan van de Ven Date: Tue, 6 Oct 2009 14:04:52 +0000 (-0700) Subject: x86: Don't use the strict copy checks when branch profiling is in use X-Git-Tag: v2.6.33-rc1~396^2~10 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ad8f4356af58f7ded6b4a5787c67c7cab51066b5;p=platform%2Fkernel%2Flinux-exynos.git 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 --- diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 1bd2e36f..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.