linux-kernel - Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT

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Message-ID: <20160309114051.GA29662@port70.net>
Date:	Wed, 9 Mar 2016 12:40:51 +0100
From:	Szabolcs Nagy <nsz@...t70.net>
To:	Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>,
	"musl@...ts.openwall.com" <musl@...ts.openwall.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation
 helpers

* Szabolcs Nagy <nsz@...t70.net> [2016-03-09 12:34:50 +0100]:
> * Ingo Molnar <mingo@...nel.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/