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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation
 helpers
Date: Wed, 9 Mar 2016 12:40:51 +0100
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* Szabolcs Nagy <nsz@port70.net> [2016-03-09 12:34:50 +0100]:
> * Ingo Molnar <mingo@kernel.org> [2016-03-09 09:56:31 +0100]:
> > Why is so much complexity added to avoid a ~3 instructions window where 
> > calcellation is tested? Cancellation at work atom boundaries is a fundamentally 
> > 'polling' model anyway, and signal delivery is asynchronous, with a fundamental 
> > IPI delay if it's cross-CPU.
> > 
> 
> to avoid the race when the thread is cancelled after the test but before
> the syscall see http://ewontfix.com/16/
> 
wrong link
http://ewontfix.com/2/