From: Ravikiran G Thirumalai <kiran@scalex86.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>,
venkatesh.pallipadi@intel.com, linux-kernel@vger.kernel.org,
tim@scalemp.com, shai@scalex86.org
Subject: Re: [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled
Date: Thu, 30 Oct 2008 14:21:21 -0700 [thread overview]
Message-ID: <20081030212121.GB6583@localdomain> (raw)
In-Reply-To: <20081030132103.2daff1e1@infradead.org>
On Thu, Oct 30, 2008 at 01:21:03PM -0700, Arjan van de Ven wrote:
>On Wed, 29 Oct 2008 19:02:03 -0700
>Ravikiran G Thirumalai <kiran@scalex86.org> wrote:
>
>well... technically the aliases are bad without PAT as well...
>
Hmm! Well, you mean if mtrr is used to change attributes?
I guess there is always a risk associated with luser space mmaping /dev/mem,
and we have CONFIG_STRICT_DEVMEM to avoid this in production.
However, for debugging tools, it is worth having the capability in _debug_
kernels and living with the risk IMHO.
Thanks,
Kiran
next prev parent reply other threads:[~2008-10-30 21:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-30 2:02 [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled Ravikiran G Thirumalai
2008-10-30 18:29 ` Ingo Molnar
2008-10-30 20:59 ` Ravikiran G Thirumalai
2008-10-30 22:55 ` Ingo Molnar
2008-10-30 20:21 ` Arjan van de Ven
2008-10-30 21:21 ` Ravikiran G Thirumalai [this message]
2008-10-30 21:29 ` Arjan van de Ven
2008-10-30 21:54 ` Ravikiran G Thirumalai
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