Re: [tip:core/locking] x86/smp: Move waiting on contended ticketlock out of line

From: H. Peter Anvin
Date: Wed Feb 13 2013 - 19:56:08 EST

On 02/13/2013 10:30 AM, Linus Torvalds wrote:
> Sadly, gcc doesn't seem to allow specifying which registers are
> clobbered any easy way, which means that both the caller and the
> callee *both* tend to need to have some asm interface. So we bothered
> to do this for __read_lock_failed, but we have *not* bothered to do
> the same for the otherwise very similar __mutex_fastpath_lock() case,
> for example.

It does for the callee, but only on a whole-file basis. It would be a
lot nicer if we could do it with function attributes.


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