Re: [patch] i386: use C code for current_thread_info()

[Andi Kleen]

Alistair John Strachan <s0348365@xxxxxxxxxxxx> writes:

> On Sunday 11 June 2006 20:42, Jan Engelhardt wrote:
> > >Using C code for current_thread_info() lets the compiler optimize it.
> > >With gcc 4.0.2, kernel is smaller:
> > >
> > >    text           data     bss     dec     hex filename
> > > 3645212         555556  312024 4512792  44dc18 2.6.17-rc6-nb-post/vmlinux
> > > 3647276         555556  312024 4514856  44e428 2.6.17-rc6-nb/vmlinux
> > > -------
> > >   -2064
> >
> > If possible, can you or someone post the results for x86_64?
> 
> Patch is for i386, x86_64's current_thread_info() is already C.

Actually read_pda() is inline assembly. But so far gcc/binutils don't support
%gs references in the way the kernel needs it directly, so it has 
to stay this way.

-Andi
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