linux-kernel - Re: [PATCH] kmemcheck: (finally) use 4k pages for identity mapping

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Message-ID: <20081020073428.GB20461@elte.hu>
Date:	Mon, 20 Oct 2008 09:34:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] kmemcheck: (finally) use 4k pages for identity mapping


* Vegard Nossum <vegard.nossum@...il.com> wrote:

> >From 760932c8607b736504a134ed6feec25e90e089ac Mon Sep 17 00:00:00 2001
> From: Vegard Nossum <vegard.nossum@...il.com>
> Date: Sun, 19 Oct 2008 15:28:04 +0200
> Subject: [PATCH] kmemcheck: (finally) use 4k pages for identity mapping
> 
> At last I found the right hooks for doing this properly. DEBUG_PAGEALLOC
> has the exact same requirement: Kernel pages must be mapped with 4k
> physical pages (since that's the size of pages returned by the page
> allocator).
> 
> Now we finally get rid of the need to do set_memory_4k() or try to work
> around TLB flushing from interrupt context. Yay!
> 
> Has been tested on both 32- and 64-bit on a P4 and a Dual Core.
> 
> Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
> ---
>  arch/x86/kernel/cpu/common.c      |    7 -------
>  arch/x86/mm/init_32.c             |    2 +-
>  arch/x86/mm/init_64.c             |    2 +-
>  arch/x86/mm/kmemcheck/kmemcheck.c |    4 ----
>  mm/kmemcheck.c                    |    8 --------
>  5 files changed, 2 insertions(+), 21 deletions(-)

nice! Pulled into tip/kmemcheck-v2, thanks Vegard.

	Ingo
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