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Re: copy_from_user_page/copy_to_user_page fix

To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Subject: Re: copy_from_user_page/copy_to_user_page fix
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 9 Feb 2005 13:51:05 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <20050209.184947.30439119.nemoto@toshiba-tops.co.jp>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20050209.184947.30439119.nemoto@toshiba-tops.co.jp>
Sender: linux-mips-bounce@linux-mips.org
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On Wed, Feb 09, 2005 at 06:49:47PM +0900, Atsushi Nemoto wrote:

> Yet another dcache aliasing problem.
> 
> Since access_process_vm() in kernel 2.6 does not call
> flush_cache_page(), it seems copy_to_user_page()/copy_from_user_page()
> should flush data cache to resolve aliasing.
> 
> Without this fix, gdb will not work correctly.  Could you apply?

I'm going to apply this because it's a correct fix; the temporary mapping
strategy as we've discussed for the dup_mmap problem would be preferable.

  Ralf

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