From: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
To: Hugh Dickins <hugh-DTz5qymZ9yRBDgjK7y7TUQ@public.gmane.org>
Cc: Nick Piggin <npiggin-l3A5Bk7waGM@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux Memory Management List
<linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>
Subject: Re: [rfc] data race in page table setup/walking?
Date: Wed, 30 Apr 2008 10:09:45 +1000 [thread overview]
Message-ID: <1209514185.18023.202.camel@pasglop> (raw)
In-Reply-To: <Pine.LNX.4.64.0804292328110.23470-popGQ1T0qN76K7/ahGyk6A@public.gmane.org>
On Tue, 2008-04-29 at 23:47 +0100, Hugh Dickins wrote:
> I am surprised it's enough to patch up the issue.
Well, we get lucky here because there's a data dependency between all
the loads... the last one needs the result from the previous one etc...
Only alpha is crazy enough to require barriers in that case as far as I
know :-)
Cheers,
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <npiggin@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-arch@vger.kernel.org,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [rfc] data race in page table setup/walking?
Date: Wed, 30 Apr 2008 10:09:45 +1000 [thread overview]
Message-ID: <1209514185.18023.202.camel@pasglop> (raw)
Message-ID: <20080430000945.5SA4_g7RroJDr6KFsr5ArilmekiLeotP1DXPktETWHo@z> (raw)
In-Reply-To: <Pine.LNX.4.64.0804292328110.23470@blonde.site>
On Tue, 2008-04-29 at 23:47 +0100, Hugh Dickins wrote:
> I am surprised it's enough to patch up the issue.
Well, we get lucky here because there's a data dependency between all
the loads... the last one needs the result from the previous one etc...
Only alpha is crazy enough to require barriers in that case as far as I
know :-)
Cheers,
Ben.
next prev parent reply other threads:[~2008-04-30 0:09 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-29 5:00 [rfc] data race in page table setup/walking? Nick Piggin
2008-04-29 5:00 ` Nick Piggin
[not found] ` <20080429050054.GC21795-B4tOwbsTzaBolqkO4TVVkw@public.gmane.org>
2008-04-29 5:08 ` Benjamin Herrenschmidt
2008-04-29 5:08 ` Benjamin Herrenschmidt
2008-04-29 5:41 ` Nick Piggin
2008-04-29 5:41 ` Nick Piggin
2008-04-29 10:56 ` David Miller
2008-04-29 10:56 ` David Miller
2008-04-29 12:36 ` Hugh Dickins
2008-04-29 12:36 ` Hugh Dickins
[not found] ` <Pine.LNX.4.64.0804291333540.22025-popGQ1T0qN76K7/ahGyk6A@public.gmane.org>
2008-04-29 21:37 ` Benjamin Herrenschmidt
2008-04-29 21:37 ` Benjamin Herrenschmidt
2008-04-29 22:47 ` Hugh Dickins
2008-04-29 22:47 ` Hugh Dickins
[not found] ` <Pine.LNX.4.64.0804292328110.23470-popGQ1T0qN76K7/ahGyk6A@public.gmane.org>
2008-04-30 0:09 ` Benjamin Herrenschmidt [this message]
2008-04-30 0:09 ` Benjamin Herrenschmidt
2008-04-30 6:03 ` Nick Piggin
2008-04-30 6:03 ` Nick Piggin
[not found] ` <20080430060340.GE27652-B4tOwbsTzaBolqkO4TVVkw@public.gmane.org>
2008-04-30 6:05 ` David Miller
2008-04-30 6:05 ` David Miller
[not found] ` <20080429.230543.98200575.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-04-30 6:17 ` Nick Piggin
2008-04-30 6:17 ` Nick Piggin
2008-04-30 11:14 ` Hugh Dickins
2008-04-30 11:14 ` Hugh Dickins
[not found] ` <Pine.LNX.4.64.0804301140490.4651-popGQ1T0qN76K7/ahGyk6A@public.gmane.org>
2008-05-01 0:35 ` Nick Piggin
2008-05-01 0:35 ` Nick Piggin
[not found] ` <20080501003542.GB11312-B4tOwbsTzaBolqkO4TVVkw@public.gmane.org>
2008-05-01 12:45 ` Hugh Dickins
2008-05-01 12:45 ` Hugh Dickins
2008-04-30 15:53 ` Linus Torvalds
2008-04-30 15:53 ` Linus Torvalds
[not found] ` <alpine.LFD.1.10.0804300848390.2997-5CScLwifNT1QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
2008-05-01 0:29 ` Nick Piggin
2008-05-01 0:29 ` Nick Piggin
[not found] ` <20080501002955.GA11312-B4tOwbsTzaBolqkO4TVVkw@public.gmane.org>
2008-05-01 3:24 ` Linus Torvalds
2008-05-01 3:24 ` Linus Torvalds
2008-05-02 1:20 ` Nick Piggin
2008-05-02 1:33 ` Linus Torvalds
2008-05-02 1:43 ` Nick Piggin
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