Re: [PATCH 1/12]: MUTEX: Implement mutexes

[Linus Torvalds <torvalds@osdl.org>]

On Sun, 18 Dec 2005, James Bottomley wrote:
> 
> Actually, I don't think you want might_sleep(): there are a few cases
> where we do an up() from under a spinlock, which will spuriously trigger
> this.  I'd suggest WARN_ON(in_interrupt()) instead.

Ahh, good point. Yes.

However, if even the arm people aren't all that interested in this, maybe 
it simply doesn't matter. A lot of other architectures either have 
"decrement in memory" or can already use ll/sc for it.

(of course, on some architectures, ll/sc is really really slow, so they 
might well prefer using a normal load and store instead).

		Linus
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