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Miller" , Jakub Kicinski , netdev@vger.kernel.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, linux-mm@kvack.org, LKML References: <20200212030355.1600749-1-jhubbard@nvidia.com> <20200212030355.1600749-2-jhubbard@nvidia.com> From: santosh.shilimkar@oracle.com Organization: Oracle Corporation Message-ID: Date: Wed, 12 Feb 2020 09:31:51 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20200212030355.1600749-2-jhubbard@nvidia.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9529 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 priorityscore=1501 clxscore=1011 impostorscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002120130 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2/11/20 7:03 PM, John Hubbard wrote: > From: Leon Romanovsky > > 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://urldefense.com/v3/__https://lore.kernel.org/r/20190723153640.GB720@lst.de__;!!GqivPVa7Brio!OJHuecs9Iup5ig3kQBi_423uMMuskWhBQAdOICrY3UQ_ZfEaxt9ySY7E8y32Q7pk5tByyA$ > > Cc: Hans Westgaard Ry > Cc: Santosh Shilimkar > Signed-off-by: Leon Romanovsky > Signed-off-by: John Hubbard > --- Change looks fine to me. Just on safer side, we will try to test this change with regression suite to make sure it works as expected. For patch itself, Acked-by: Santosh Shilimkar