Re: [PATCH 1/5] pagemap: document clarifications
From: Tommi Rantala
Date: Tue Apr 28 2009 - 03:11:49 EST
2009/4/28 Wu Fengguang <fengguang.wu@xxxxxxxxx>:
> Some bit ranges were inclusive and some not.
> Fix them to be consistently inclusive.
>
> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
> ---
> 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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