linux-kernel - Re: [PATCH 1/5] pagemap: document clarifications

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Date:	Tue, 28 Apr 2009 10:11:37 +0300
From:	Tommi Rantala <tt.rantala@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 1/5] pagemap: document clarifications

2009/4/28 Wu Fengguang <fengguang.wu@...el.com>:
> Some bit ranges were inclusive and some not.
> Fix them to be consistently inclusive.
>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
>  Documentation/vm/pagemap.txt |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> --- mm.orig/Documentation/vm/pagemap.txt
> +++ mm/Documentation/vm/pagemap.txt
> @@ -12,9 +12,9 @@ There are three components to pagemap:
>    value for each virtual page, containing the following data (from
>    fs/proc/task_mmu.c, above pagemap_read):
>
> -    * Bits 0-55  page frame number (PFN) if present
> +    * Bits 0-54  page frame number (PFN) if present
>     * Bits 0-4   swap type if swapped
> -    * Bits 5-55  swap offset if swapped
> +    * Bits 5-54  swap offset if swapped
>     * Bits 55-60 page shift (page size = 1<<page shift)
>     * Bit  61    reserved for future use
>     * Bit  62    page swapped

The same fix should be applied to fs/proc/task_mmu.c as well,
it includes the same description of the bits.

Regards,
Tommi Rantala
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