linux-kernel - Re: alpha: potential race around hae_cache in RESTORE

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Message-ID: <20100925192509.GX19804@ZenIV.linux.org.uk>
Date:	Sat, 25 Sep 2010 20:25:09 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	rth@...ddle.net, linux-kernel@...r.kernel.org
Subject: Re: alpha: potential race around hae_cache in RESTORE_ALL

On Sat, Sep 25, 2010 at 08:18:36PM +0100, Al Viro wrote:
> Agreed.  There are only two places that need change (return to kernel path
> in ret_from_syscall and kernel_thread essentially jumping to the same path),
> so I'll just add
> ret_to_kernel:
>         lda     $16, 7
>         call_pal PAL_swpipl
> 	br	restore_all
> and make these two places go to ret_to_kernel instead of restore_all.

BTW, am I right assuming that HAE modifications is UP-only thing?  It would
be obviously b0rken on any SMP box, since alpha_mv is not per-CPU thing...
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