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From: gilles.chanteperdrix@xenomai.org (Gilles Chanteperdrix)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: mm: avoid attempting to flush the gate_vma with VIVT caches
Date: Sat, 21 Jul 2012 15:18:35 +0200	[thread overview]
Message-ID: <500AAC2B.5060300@xenomai.org> (raw)
In-Reply-To: <5009C26B.6080901@xenomai.org>

On 07/20/2012 10:41 PM, Gilles Chanteperdrix wrote:
> Being 0 or 1 whether we want to flush the vector page (I believe we do
> not want to flush it, but am not sure).

Actually, I believe we want to flush the vector page, at least on
systems with VIVT cache: on systems with VIVT cache, the vector page is
writeable in kernel mode, so may have been modified, and the address
used by elf_core_dump is not the vectors address, but the address in the
kernel direct-mapped RAM region where the vector page was allocated, so
there is a cache aliasing issue.

-- 
                                                                Gilles.

  reply	other threads:[~2012-07-21 13:18 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-16 16:23 [PATCH] ARM: mm: avoid attempting to flush the gate_vma with VIVT caches Will Deacon
2012-07-19 12:28 ` Will Deacon
2012-07-19 13:03   ` Uros Bizjak
2012-07-19 16:37     ` Will Deacon
2012-07-20 20:41   ` Gilles Chanteperdrix
2012-07-21 13:18     ` Gilles Chanteperdrix [this message]
2012-07-21 14:35       ` Will Deacon
2012-07-21 14:40         ` Gilles Chanteperdrix
2012-07-21 14:47           ` Gilles Chanteperdrix
2012-07-22 13:03             ` Will Deacon
2012-07-22 13:26               ` Gilles Chanteperdrix
2012-07-22 15:09                 ` Will Deacon
2012-07-22 15:35                   ` Gilles Chanteperdrix
2012-07-22 16:57                   ` Uros Bizjak

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