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Date: Sun, 16 Feb 2020 18:37:31 -0800 (PST) From: David Miller <davem@...emloft.net> To: jhubbard@...dia.com Cc: akpm@...ux-foundation.org, santosh.shilimkar@...cle.com, hans.westgaard.ry@...cle.com, leonro@...lanox.com, kuba@...nel.org, netdev@...r.kernel.org, rds-devel@....oracle.com, linux-rdma@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/1] net/rds: Track user mapped pages through special API From: John Hubbard <jhubbard@...dia.com> Date: Tue, 11 Feb 2020 19:03:55 -0800 > From: Leon Romanovsky <leonro@...lanox.com> > > Convert net/rds to use the newly introduces pin_user_pages() API, > which properly sets FOLL_PIN. Setting FOLL_PIN is now required for > code that requires tracking of pinned pages. > > Note that this effectively changes the code's behavior: it now > ultimately calls set_page_dirty_lock(), instead of set_page_dirty(). > This is probably more accurate. > > As Christoph Hellwig put it, "set_page_dirty() is only safe if we are > dealing with a file backed page where we have reference on the inode it > hangs off." [1] > > [1] https://lore.kernel.org/r/20190723153640.GB720@lst.de > > Cc: Hans Westgaard Ry <hans.westgaard.ry@...cle.com> > Cc: Santosh Shilimkar <santosh.shilimkar@...cle.com> > Signed-off-by: Leon Romanovsky <leonro@...lanox.com> > Signed-off-by: John Hubbard <jhubbard@...dia.com> Applied, thank you.
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