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x86: Don't use the strict copy checks when branch profiling is in use

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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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2
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.