Re: [git pull] x86 fixes

[Adrian Bunk]

On Mon, Sep 08, 2008 at 11:04:30AM -0700, Linus Torvalds wrote:
> 
> 
> On Mon, 8 Sep 2008, H. Peter Anvin wrote:
> >  
> >  config X86_GENERIC
> > -	bool "Generic x86 support"
> > +	bool "Generic x86 support" if EMBEDDED
> 
> Ok, so after having realized that this seems to be more about a bug with 
> gcc, I'm really not as convinced any more.
> 
> As far as I can tell, there are three issues:
> 
>  - "-mtune=core/core2/pentium4/.." is buggy in some gas/gcc versions on 
>    x86-32, and makes architectural choices.
> 
>    Any actual _released_ versions? Maybe it's just a current SVN issue?
> 
>    Workaround: don't use it. And yes, X86_GENERIC=y will do that, although 
>    quite frankly that seems to be dubious in itself.
>...

As far as I understood it it's a gas issue, and X86_GENERIC=y would 
therefore *not* fix the bug with gcc < 4.2 and affected binutils
since we pass -mtune=i686 for gcc < 4.2 with X86_GENERIC=y.

Anything I miss?

> 		Linus

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/