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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>
This commit is contained in:
Arjan van de Ven 2009-10-06 07:04:52 -07:00 committed by Ingo Molnar
parent ae24ffe5ec
commit ad8f4356af
1 changed files with 1 additions and 1 deletions
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arch/x86/Kconfig.debug
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@ -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.