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Re: [Xen-devel] [PATCH 00/34] put_user_pages(): miscellaneous call sites
- To: john.hubbard@xxxxxxxxx
- From: Michal Hocko <mhocko@xxxxxxxxxx>
- Date: Fri, 2 Aug 2019 11:12:44 +0200
- Cc: linux-fbdev@xxxxxxxxxxxxxxx, Jan Kara <jack@xxxxxxx>, kvm@xxxxxxxxxxxxxxx, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, Ira Weiny <ira.weiny@xxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, devel@xxxxxxxxxxxxxxxxxxxx, rds-devel@xxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, John Hubbard <jhubbard@xxxxxxxxxx>, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, Jérôme Glisse <jglisse@xxxxxxxxxx>, linux-rpi-kernel@xxxxxxxxxxxxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 02 Aug 2019 09:12:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu 01-08-19 19:19:31, john.hubbard@xxxxxxxxx wrote:
[...]
> 2) Convert all of the call sites for get_user_pages*(), to
> invoke put_user_page*(), instead of put_page(). This involves dozens of
> call sites, and will take some time.
How do we make sure this is the case and it will remain the case in the
future? There must be some automagic to enforce/check that. It is simply
not manageable to do it every now and then because then 3) will simply
be never safe.
Have you considered coccinele or some other scripted way to do the
transition? I have no idea how to deal with future changes that would
break the balance though.
--
Michal Hocko
SUSE Labs
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