From mboxrd@z Thu Jan 1 00:00:00 1970 From: Calum Mackay Date: Sat, 03 Aug 2019 01:27:55 +0000 Subject: Re: [PATCH 31/34] nfs: convert put_page() to put_user_page*() Message-Id: <1738cb1e-15d8-0bbe-5362-341664f6efc8@oracle.com> List-Id: References: <20190802022005.5117-1-jhubbard@nvidia.com> <20190802022005.5117-32-jhubbard@nvidia.com> In-Reply-To: <20190802022005.5117-32-jhubbard@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: john.hubbard@gmail.com, Andrew Morton Cc: linux-fbdev@vger.kernel.org, Jan Kara , kvm@vger.kernel.org, Dave Hansen , Dave Chinner , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, calum.mackay@oracle.com, devel@driverdev.osuosl.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, x86@kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , xen-devel@lists.xenproject.org, devel@lists.orangefs.org, linux-media@vger.kernel.org, John Hubbard , intel-gfx@lists.freedesktop.org, Dan Williams , linux-block@vger.kernel.org, =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , linux-rpi-kernel@lists.infradead.org, ceph-devel@vger.kernel.org, Trond Myklebust , linux-arm-kernel@lists.i On 02/08/2019 3:20 am, john.hubbard@gmail.com wrote: > From: John Hubbard > > For pages that were retained via get_user_pages*(), release those pages > via the new put_user_page*() routines, instead of via put_page() or > release_pages(). > > This is part a tree-wide conversion, as described in commit fc1d8e7cca2d > ("mm: introduce put_user_page*(), placeholder versions"). > > Cc: Trond Myklebust > Cc: Anna Schumaker > Cc: linux-nfs@vger.kernel.org > Signed-off-by: John Hubbard > --- > fs/nfs/direct.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > > diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c > index 0cb442406168..b00b89dda3c5 100644 > --- a/fs/nfs/direct.c > +++ b/fs/nfs/direct.c > @@ -278,9 +278,7 @@ ssize_t nfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) > > static void nfs_direct_release_pages(struct page **pages, unsigned int npages) > { > - unsigned int i; > - for (i = 0; i < npages; i++) > - put_page(pages[i]); > + put_user_pages(pages, npages); > } Since it's static, and only called twice, might it be better to change its two callers [nfs_direct_{read,write}_schedule_iovec()] to call put_user_pages() directly, and remove nfs_direct_release_pages() entirely? thanks, calum. > > void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, >