* Use of mmap_sem in map_user_kiobuf
@ 2001-07-06 10:50 Adrian Cox
2001-07-06 16:56 ` Andrea Arcangeli
0 siblings, 1 reply; 2+ messages in thread
From: Adrian Cox @ 2001-07-06 10:50 UTC (permalink / raw)
To: linux-mm
Does map_user_kiobuf really need to get a write lock on the mmap_sem?
From examination of the code, all it can do is expand_stack(), fault in
pages, and increment the count on a page.
Is there anything I've missed? Would it be safe to use down_read(),
up_read() instead?
--
Adrian Cox http://www.humboldt.co.uk/
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* Re: Use of mmap_sem in map_user_kiobuf
2001-07-06 10:50 Use of mmap_sem in map_user_kiobuf Adrian Cox
@ 2001-07-06 16:56 ` Andrea Arcangeli
0 siblings, 0 replies; 2+ messages in thread
From: Andrea Arcangeli @ 2001-07-06 16:56 UTC (permalink / raw)
To: Adrian Cox; +Cc: linux-mm
On Fri, Jul 06, 2001 at 11:50:38AM +0100, Adrian Cox wrote:
> Does map_user_kiobuf really need to get a write lock on the mmap_sem?
> From examination of the code, all it can do is expand_stack(), fault in
> pages, and increment the count on a page.
>
> Is there anything I've missed? Would it be safe to use down_read(),
> up_read() instead?
yes, it should be ok.
Andrea
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