From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: rth@twiddle.net, linux-kernel@vger.kernel.org
Subject: Re: alpha: potential race around hae_cache in RESTORE_ALL
Date: Sat, 25 Sep 2010 20:25:09 +0100 [thread overview]
Message-ID: <20100925192509.GX19804@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20100925191836.GW19804@ZenIV.linux.org.uk>
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...
next prev parent reply other threads:[~2010-09-25 19:25 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-25 18:13 alpha: potential race around hae_cache in RESTORE_ALL Al Viro
2010-09-25 18:42 ` Linus Torvalds
2010-09-25 19:18 ` Al Viro
2010-09-25 19:25 ` Al Viro [this message]
[not found] ` <AANLkTikEVr6wA6D_f2Z6OEFu6SCP_-89u0-k-K-wKgb=@mail.gmail.com>
2010-09-25 21:33 ` Linus Torvalds
2010-09-27 7:58 ` Ivan Kokshaysky
2010-09-27 12:12 ` Al Viro
2010-09-27 12:46 ` Al Viro
2010-09-27 16:26 ` Ivan Kokshaysky
2010-09-27 17:10 ` Linus Torvalds
2010-09-27 18:05 ` Richard Henderson
2010-09-27 19:01 ` Al Viro
2010-09-27 21:21 ` Ivan Kokshaysky
2010-09-25 20:07 ` [PATCH] alpha: fix hae_cache race " Al Viro
2010-09-25 20:07 ` [PATCH] alpha: fix usp value in multithreaded coredumps Al Viro
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