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Wed, 4 Jan 2023 18:09:46 +0000 (GMT) Date: Wed, 4 Jan 2023 19:09:44 +0100 From: Heiko Carstens To: Mike Kravetz Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, Christoph Hellwig , David Hildenbrand , Michal Hocko , Peter Xu , Nadav Amit , Matthew Wilcox , Vlastimil Babka , Rik van Riel , Will Deacon , Michael Ellerman , Palmer Dabbelt , Christian Borntraeger , Dave Hansen , Christian Brauner , Eric Dumazet , Andrew Morton Subject: Re: [PATCH] mm: remove zap_page_range and create zap_vma_pages Message-ID: References: <20230104002732.232573-1-mike.kravetz@oracle.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230104002732.232573-1-mike.kravetz@oracle.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: k9qXecJ4RRKrWMjkiEzD557REdxr7RO2 X-Proofpoint-GUID: QiYQILsN1_8J76fc1D6yWsOXcnh_ZlS9 X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2023-01-04_07,2023-01-04_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 priorityscore=1501 malwarescore=0 impostorscore=0 spamscore=0 adultscore=0 bulkscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 lowpriorityscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301040151 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Tue, Jan 03, 2023 at 04:27:32PM -0800, Mike Kravetz wrote: > zap_page_range was originally designed to unmap pages within an address > range that could span multiple vmas. While working on [1], it was > discovered that all callers of zap_page_range pass a range entirely within > a single vma. In addition, the mmu notification call within zap_page > range does not correctly handle ranges that span multiple vmas. When > crossing a vma boundary, a new mmu_notifier_range_init/end call pair > with the new vma should be made. > > Instead of fixing zap_page_range, do the following: > - Create a new routine zap_vma_pages() that will remove all pages within > the passed vma. Most users of zap_page_range pass the entire vma and > can use this new routine. > - For callers of zap_page_range not passing the entire vma, instead call > zap_page_range_single(). > - Remove zap_page_range. > > [1] https://lore.kernel.org/linux-mm/20221114235507.294320-2-mike.kravetz@oracle.com/ > Suggested-by: Peter Xu > Signed-off-by: Mike Kravetz > --- > RFC->v1 Created zap_vma_pages to zap entire vma (Christoph Hellwig) > Did not add Acked-by's as routine was changed. > > arch/arm64/kernel/vdso.c | 6 ++--- > arch/powerpc/kernel/vdso.c | 4 +--- > arch/powerpc/platforms/book3s/vas-api.c | 2 +- > arch/powerpc/platforms/pseries/vas.c | 3 +-- > arch/riscv/kernel/vdso.c | 6 ++--- > arch/s390/kernel/vdso.c | 4 +--- > arch/s390/mm/gmap.c | 2 +- > arch/x86/entry/vdso/vma.c | 4 +--- > drivers/android/binder_alloc.c | 2 +- > include/linux/mm.h | 7 ++++-- > mm/memory.c | 30 ------------------------- > mm/page-writeback.c | 2 +- > net/ipv4/tcp.c | 7 +++--- > 13 files changed, 21 insertions(+), 58 deletions(-) For s390: Acked-by: Heiko Carstens