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

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Date:	Fri, 09 Jan 2009 22:13:48 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	alexey.zaytsev@...il.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, rostedt@...dmis.org
Subject: Re: [PATCH] Disable branch profiling macros when sparsed.

From: Alexey Zaytsev <alexey.zaytsev@...il.com>
Date: Sat, 10 Jan 2009 08:57:28 +0300

> 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>

If even sparse can't handle these things, it's no surprise
how many gcc bogus warning problems we've run into because
of this hairy if() macro.

I don't think it's a good precedence to do this.  It's giving
up on trying to implement the branch tracer in a way that
results in a kernel build that produces useful warnings.
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