Re: [PATCH 1/5] signal(x86_32): Improve the signal stack overflowcheck

[H. Peter Anvin]

Paul Mackerras wrote:
> Ingo Molnar writes:
> > * Shi Weihua <shiwh@xxxxxxxxxxxxxx> wrote:
> >
> > > We need to check for stack overflow only when the signal is on stack. 
> > > So we can improve the patch "http://lkml.org/lkml/2007/11/27/101"; as 
> > > following.
> > thanks, applied.
>
> These patches change the behaviour of programs that longjmp out of a
> signal handler on an alternate stack, don't they?
>
> I'm interested to know what gave you confidence that changing that
> behaviour won't break existing working programs.

Shouldn't such programs use sigsetjmp/siglongjmp, which should reset the 
signal stack state?

	-hpa
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