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[67.164.59.41]) by smtp.googlemail.com with ESMTPSA id 41be03b00d2f7-b38ee4794f4sm15169458a12.25.2025.07.09.12.41.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Jul 2025 12:42:00 -0700 (PDT) From: "Vishal Moola (Oracle)" To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, "Matthew Wilcox (Oracle)" , David Hildenbrand , Jordan Rome , Andrew Morton , "Vishal Moola (Oracle)" Subject: [PATCH 2/3] mm/memory.c: Use folios in __access_remote_vm() Date: Wed, 9 Jul 2025 12:40:17 -0700 Message-ID: <20250709194017.927978-5-vishal.moola@gmail.com> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250709194017.927978-3-vishal.moola@gmail.com> References: <20250709194017.927978-3-vishal.moola@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use kmap_local_folio() instead of kmap_local_page(). Replaces 2 calls to compound_head() with one. This prepares us for the removal of unmap_and_put_page(). Signed-off-by: Vishal Moola (Oracle) Acked-by: David Hildenbrand --- mm/memory.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index d63f0d5abcc9..3dd6c57e6511 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -6691,6 +6691,7 @@ static int __access_remote_vm(struct mm_struct *mm, u= nsigned long addr, while (len) { int bytes, offset; void *maddr; + struct folio *folio; struct vm_area_struct *vma =3D NULL; struct page *page =3D get_user_page_vma_remote(mm, addr, gup_flags, &vma); @@ -6722,21 +6723,22 @@ static int __access_remote_vm(struct mm_struct *mm,= unsigned long addr, if (bytes <=3D 0) break; } else { + folio =3D page_folio(page); bytes =3D len; offset =3D addr & (PAGE_SIZE-1); if (bytes > PAGE_SIZE-offset) bytes =3D PAGE_SIZE-offset; =20 - maddr =3D kmap_local_page(page); + maddr =3D kmap_local_folio(folio, folio_page_idx(folio, page) * PAGE_SI= ZE); if (write) { copy_to_user_page(vma, page, addr, maddr + offset, buf, bytes); - set_page_dirty_lock(page); + folio_mark_dirty_lock(folio); } else { copy_from_user_page(vma, page, addr, buf, maddr + offset, bytes); } - unmap_and_put_page(page, maddr); + folio_release_kmap(folio, maddr); } len -=3D bytes; buf +=3D bytes; --=20 2.50.0