linux-kernel - Re: [PATCH] Built kernel without -O2 option

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Message-ID: <13378.1291053822@localhost>
Date:	Mon, 29 Nov 2010 13:03:42 -0500
From:	Valdis.Kletnieks@...edu
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Hui Zhu <teawater@...il.com>, linux-kernel@...r.kernel.org,
	gdb@...rceware.org, hellogcc@...elists.org
Subject: Re: [PATCH] Built kernel without -O2 option

On Mon, 29 Nov 2010 16:52:50 +0800, Américo Wang said:

> >For example:
> >ifdef CONFIG_CC_CLOSE_OPTIMIZATION
> >CFLAGS_fpu.o                           += -O2
> >CFLAGS_aesni-intel_glue.o              += -O2
> >CFLAGS_ghash-clmulni-intel_glue.o      += -O2
> >endif
> 
> No, I didn't mean this, I meant some function that have to be inlined
> are those who only work when being inlined, e.g. current_text_addr().
> 
> I think it is not alone. :)

Anything that uses the gcc __builtin_return_adress() extension should also be
audited - that returns different results for inlined and non-inlined callers.


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