Messages in this thread Patch in this message | | | Date | Tue, 6 Oct 2009 07:04:52 -0700 | From | Arjan van de Ven <> | Subject | [PATCH] x86: Don't use the strict copy checks when branch profiling is in use |
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From 3719b55e3091ad2cf8c2cfc358223c2b749ff3fd Mon Sep 17 00:00:00 2001 From: Arjan van de Ven <arjan@linux.intel.com> Date: Tue, 6 Oct 2009 07:02:10 -0700 Subject: [PATCH] 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 <arjan@linux.intel.com> --- 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. -- 1.6.2.5
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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