linux-kernel - Re: [PATCH] NOMMU: use copy_*_user_page() in access_process

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Date:	Wed, 2 Dec 2009 23:07:37 +0800
From:	Jie Zhang <jie.zhang@...log.com>
To:	David Howells <dhowells@...hat.com>
CC:	Mike Frysinger <vapier@...too.org>, uclinux-dev@...inux.org,
	David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.org>,
	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH] NOMMU: use copy_*_user_page() in access_process_vm()

On 12/02/2009 10:45 PM, David Howells wrote:
> Mike Frysinger<vapier@...too.org>  wrote:
>
>> The mmu code uses the copy_*_user_page() variants in access_process_vm()
>> rather than copy_*_user() as the former includes an icache flush.  This is
>> important when doing things like setting software breakpoints with gdb.
>> So switch the nommu code over to do the same.
>
> Note that we may only really want to do an icache flush if the target region
> is mapped executable somewhere.  On the other hand, for debugging stuff on an
> embedded board, it probably doesn't matter.
>
It is not checked before icache flush even for MMU. This is a place we 
can do some improvement. But it's not important for debugging.


Jie
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