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authorArjan van de Ven <arjan@infradead.org>2009-10-06 16:04:52 +0200
committerIngo Molnar <mingo@elte.hu>2009-10-12 22:29:51 +0200
commitad8f4356af58f7ded6b4a5787c67c7cab51066b5 (patch)
tree08aea59cda46a4c627714cd63eb970b127f228d3 /arch/x86/Kconfig.debug
parentx86, 64-bit: Move K8 B step iret fixup to fault entry asm (diff)
downloadlinux-ad8f4356af58f7ded6b4a5787c67c7cab51066b5.tar.xz
linux-ad8f4356af58f7ded6b4a5787c67c7cab51066b5.zip
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> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <20091006070452.5e1fc119@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/Kconfig.debug')
-rw-r--r--arch/x86/Kconfig.debug2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 1bd2e36f1538..fb772b6a41ad 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.