Re: [PATCH 1/11] Add generic helpers for arch IPI function calls

[Jens Axboe]

On Tue, Apr 22 2008, Linus Torvalds wrote:
> 
> 
> On Tue, 22 Apr 2008, Jens Axboe wrote:
> > 
> > But wait, falling back to wait cannot always be safe if we are called
> > with interrupts disabled. I don't see any way around using the global
> > fallback for that case.
> 
> Hmm. Good point. It does look like you need three cases.

OK, so how about this then? All three cases for both
smp_call_function_single() and smp_call_function_mask(). Data is always
freed in the ipi interrupt handler, since the 'wait' case is always
allocated on the stack.