Re: [PATCHv5 1/3] mm: export use_mm/unuse_mm to modules

From: Gregory Haskins
Date: Fri Aug 28 2009 - 11:31:47 EST

Michael S. Tsirkin wrote:
> vhost net module wants to do copy to/from user from a kernel thread,
> which needs use_mm (like what fs/aio has). Move that into mm/ and
> export to modules.

Michael, Andrew,

I am just curious: Is there any technical reason why a kthread cannot
have a long-term use_mm() in effect? (Assuming this makes sense for the
design, of course). For the cases there we know the kthread will always
service the same context (such as with venettap/vhost, it may make sense
to do a use_mm() at init time and just leave it until the thread exits.
Will this break anything?

Kind Regards,

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