linux-kernel - Re: [PATCH ftrace.git] Immedate Values Optimized Jump Fix

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Message-ID: <48812962.1010809@zytor.com>
Date:	Fri, 18 Jul 2008 16:38:10 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
CC:	Ingo Molnar <mingo@...e.hu>, Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH ftrace.git] Immedate Values Optimized Jump Fix

Mathieu Desnoyers wrote:
> 
> The generated code you are talking about will generate a different code
> pattern, won't it (e.g. saving the registers on the stack before the
> branch) ? And in this case, we fall-back on the standard immediate
> values.
> 

Not necessarily, and you *certainly* can't rely on pattern analysis to 
determine when it's unsafe.

	-hpa
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