linux-kernel - Re: [PATCH 20/40] mn10300: Use set_current_blocked() and block

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Message-ID: <17603.1329234976@redhat.com>
Date:	Tue, 14 Feb 2012 15:56:16 +0000
From:	David Howells <dhowells@...hat.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	dhowells@...hat.com, linux-arch@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Matt Fleming <matt.fleming@...el.com>,
	Koichi Yasutake <yasutake.koichi@...panasonic.com>,
	Al Viro <viro@...iv.linux.org.uk>, linux-am33-list@...hat.com
Subject: Re: [PATCH 20/40] mn10300: Use set_current_blocked() and block_sigmask()

Matt Fleming <matt@...sole-pimps.org> wrote:

>  asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
>  {
> -	mask &= _BLOCKABLE;
> -	spin_lock_irq(&current->sighand->siglock);
> +	sigset_t blocked;
> +
>  	current->saved_sigmask = current->blocked;

Can this line create a race, now that it's not protected by a lock?  It is
possible for current->blocked to get altered by another thread.

David
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