Re: [PATCH 03/13] jump label v9: x86 support

[H. Peter Anvin]

On 06/10/2010 05:14 AM, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> 
>> On Wed, 2010-06-09 at 17:39 -0400, Jason Baron wrote:
>>> +       select HAVE_ARCH_JUMP_LABEL if !CC_OPTIMIZE_FOR_SIZE
>>
>> That deserves a comment somewhere, it basically makes OPTIMIZE_FOR_SIZE 
>> useless...
> 
> Hm, we need more than a comment for that - distros enable CC_OPTIMIZE_FOR_SIZE 
> all the time, for the massive kernel image (and hotpath cache footprint) 
> savings. Is this fixable?
> 

Actually the current reports from the gcc community is that gcc 4.5.0 +
-Os produces a broken kernel even without asm goto:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44129

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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