linux-kernel - Re: [PATCH] generic signal code (small new feature

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Message-ID: <p731wp8e6ew.fsf@verdi.suse.de>
Date:	16 Oct 2006 15:28:39 +0200
From:	Andi Kleen <ak@...e.de>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	linux-kernel@...r.kernel.org, gk@...ethknight.com
Subject: Re: [PATCH] generic signal code (small new feature - userspace signal mask), kernel 2.6.16

Linus Torvalds <torvalds@...l.org> writes:
> 
> Why? You're doing user-space accesses from within critical sections with a 
> spinlock, and that's just a big no-no. Think page faults, swapping etc.

He could pin the page in memory like futexes do. One page pinned
per thread shouldn't be a big DOS issue either.

-Andi
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