>
>
> Subject: shm swapping broken in 2.3.2[345]
> Date: 03 Nov 1999 11:25:34 +0100
> From: Christoph Rohland <hans-christoph.rohland@sap.com>
> To: linux-kernel@vger.rutgers.edu, Ingo Molnar <mingo@chiara.csoma.elte.hu>
>
> Hi,
>
> I am doing some shm swap tests on recent kernels. In the 2.3.25 Linux
> does not swap any shm pages out. I traced it down to the fact, that
> page_count is always > 0.
>
> I am not sure if this also happens in 2.3.2[34] since there other
> things also break.
>
> Any help appreciated
>
> Christoph
>
> -
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The problem appears to be in linux/ipc/shm.c in function shm_swap().
The "if (page_count(page_map))" should be "if (page_count(page_map) != 1)".
The page_map->count could not be zero here because it would have already
been freed by the last call to __free_page().
Larry Woodman
Mission Critical Linux(www.missioncriticallinux.com)
This patch applies to ipc/shm.c under 2.3.25.
--------------48276C80DF2A9C29B72442DE
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name="patch-2.3.25.shm"
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filename="patch-2.3.25.shm"
791c791
< if (page_count(page_map))
--- > if (page_count(page_map) != 1)--------------48276C80DF2A9C29B72442DE--
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