From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Linus Torvalds <torvalds@osdl.org>
Cc: David Miller <davem@davemloft.net>,
nickpiggin@yahoo.com.au, ralf@linux-mips.org,
Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
anemo@mba.ocn.ne.jp, linux-arch@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH 1/3] Fix COW D-cache aliasing on fork
Date: Fri, 20 Oct 2006 22:28:05 +0100 [thread overview]
Message-ID: <20061020212805.GG8894@flint.arm.linux.org.uk> (raw)
In-Reply-To: <Pine.LNX.4.64.0610201408070.3962@g5.osdl.org>
On Fri, Oct 20, 2006 at 02:12:11PM -0700, Linus Torvalds wrote:
> On Fri, 20 Oct 2006, Russell King wrote:
> > Well, looking at do_wp_page() I'm now quite concerned about ARM and COW.
> > I can't see how this code could _possibly_ work with a virtually indexed
> > cache as it stands. Yet, the kernel does appear to work.
>
> It really shouldn't need any extra code, exactly because by the time it
> hits any page-fault, the caches had better be in sync with the physical
> page contents _anyway_ (yes, being virtual, the caches will _duplicate_
> the contents, but since the pages are read-only, that aliasing should be
> perfectly fine).
Oh, of course! That explains why it actually works as expected! Thanks
for filling back in that bit of swapped-out-years-ago-and-lost information.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
next prev parent reply other threads:[~2006-10-20 21:28 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-19 16:35 [PATCH 1/3] Fix COW D-cache aliasing on fork Ralf Baechle
2006-10-19 16:35 ` [PATCH 2/3] Pass vma argument to copy_user_highpage() Ralf Baechle
2006-10-19 16:35 ` [PATCH 3/3] MIPS: Fix COW D-cache aliasing on fork Ralf Baechle
2006-10-22 2:32 ` Ralf Baechle
2006-10-19 17:46 ` [PATCH 1/3] " Nick Piggin
2006-10-19 18:13 ` Ralf Baechle
2006-10-19 18:48 ` Nick Piggin
2006-10-19 22:59 ` David Miller
2006-10-20 14:39 ` Nick Piggin
2006-10-20 15:49 ` Linus Torvalds
2006-10-20 15:57 ` Nick Piggin
2006-10-20 16:36 ` Linus Torvalds
2006-10-20 16:47 ` Nick Piggin
2006-10-20 17:16 ` Linus Torvalds
2006-10-20 17:37 ` Nick Piggin
2006-10-21 0:46 ` Ralf Baechle
2006-10-20 19:36 ` David Miller
2006-10-20 19:54 ` Linus Torvalds
2006-10-20 19:58 ` David Miller
2006-10-20 20:10 ` Linus Torvalds
2006-10-20 20:59 ` Russell King
2006-10-20 21:06 ` David Miller
2006-10-20 21:17 ` Russell King
2006-10-20 21:30 ` David Miller
2006-10-20 21:12 ` Linus Torvalds
2006-10-20 21:28 ` Russell King [this message]
2006-10-20 21:41 ` Ralf Baechle
2006-10-21 16:28 ` Atsushi Nemoto
2006-10-20 21:49 ` Ralf Baechle
2006-10-20 22:02 ` Linus Torvalds
2006-10-20 22:22 ` David Miller
2006-10-20 22:51 ` Ralf Baechle
2006-10-20 23:28 ` Linus Torvalds
2006-10-21 0:06 ` Ralf Baechle
2006-10-21 0:38 ` Linus Torvalds
2006-10-21 1:29 ` Paul Mackerras
2006-10-21 2:11 ` David Miller
2006-10-21 2:37 ` Linus Torvalds
2006-10-21 2:46 ` David Miller
2006-10-21 18:27 ` Ralf Baechle
2006-10-22 1:34 ` Ralf Baechle
2006-12-02 9:49 ` Russell King
2006-10-23 8:50 ` Martin Schwidefsky
2006-10-20 16:05 ` Ralf Baechle
2006-10-20 16:30 ` Nick Piggin
2006-10-20 19:23 ` David Miller
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