linux-kernel - Re: [PATCH 2/4] jump label

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Date:	Sat, 26 Sep 2009 06:21:26 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Roland McGrath <roland@...hat.com>
Cc:	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, mathieu.desnoyers@...ymtl.ca, tglx@...utronix.de,
	ak@...e.de, rth@...hat.com, mhiramat@...hat.com
Subject: Re: [PATCH 2/4] jump label - base patch

On Thu, 2009-09-24 at 17:49 -0700, Roland McGrath wrote:
> > +#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
> > +#define __HAVE_ARCH_JUMP_LABEL
> > +#endif
> 
> Put this in linux/compiler-gcc4.h (there only test __GNUC_MINOR__).
> If icc/whoever adds asm goto they can define it too.

We need to be careful here. This code also depends on the text_poke
implementation that is not defined for every arch.

The code around DEFINE_TRACE can be updated to test for
__HAVE_ARCH_JUMP_LABEL as well the config to know if we have text_poke.

-- Steve


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