linux-kernel - [PATCH] Disable branch profiling macros when sparsed.

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Message-ID: <20090110052727.5471.3654.stgit@zaytsev.su>
Date:	Sat, 10 Jan 2009 08:57:28 +0300
From:	Alexey Zaytsev <alexey.zaytsev@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH] Disable branch profiling macros when sparsed.

The macros produce lots of unneeded warnings when
recursive if(({ .. if() {..} ..})) {..} and such
are substituted. And there is no point in sparsing
them anyway. This is useful if someone decides to
sparse an allyesconfig kernel.

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@...il.com>
---

Also, there is little point in profiling unlikely() inside
WARN_ON() and friends, so maybe they should be replaced
with the _notrace counterparts?

 include/linux/compiler.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index d95da10..f5f173b 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -17,6 +17,7 @@
 # define __cond_lock(x,c)	((c) ? ({ __acquire(x); 1; }) : 0)
 extern void __chk_user_ptr(const volatile void __user *);
 extern void __chk_io_ptr(const volatile void __iomem *);
+# define DISABLE_BRANCH_PROFILING
 #else
 # define __user
 # define __kernel

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