Re: [GIT PULL] Additional x86 fixes for 2.6.31-rc5

[Linus Torvalds]

On Sat, 1 Aug 2009, H. Peter Anvin wrote:
> 
> This is clearly better... now the semi-obvious question becomes if there
> is any way we can get compiler support to do better and migrate to that
> as the compiler allows.

Well, even if we had compiler support, we'd have to basically then wait 
forever to make sure everybody has a supported compiler. So I think we're 
better off not worrying too much about that - it's not going to happen any 
time in the near future.

I've now tested my patch, and it seems to result in a working kernel too. 

> In particular, if I remember right the problem with using __thread for 
> percpu was exactly that the current cpuness can change almost anywhere, 
> unless preemption is disabled.

That shouldn't matter. If it uses '%gs', it should all just work 
automatically. But if gcc does something different for thread-local, it's 
basically useless.

			Linus
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