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

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Message-ID: <20100927075828.GA15344@jurassic.park.msu.ru>
Date:	Mon, 27 Sep 2010 11:58:28 +0400
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, 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 08:25:09PM +0100, Al Viro wrote:
> 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...

The only SMP system that does HAE modifications at runtime is T2, so it has
a spinlock protection around set_hae() - see core_t2.h. Others are either
limited to use HAE window 0 only, or do not have HAE hardware at all.

Ivan.
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