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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , "Matthew Wilcox (Oracle)" , Jan Kara , Miaohe Lin , Naoya Horiguchi , Rik van Riel , Harry Yoo , Lance Yang , Kees Cook , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Usama Arif , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Peter Xu , Xu Xin , Chengming Zhou , Arnd Bergmann , Greg Kroah-Hartman Cc: "Lorenzo Stoakes (ARM)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4872; i=ljs@kernel.org; h=from:subject:message-id; bh=2t5Mr+R+1YvTkz9Ej+HDVNRXrsa9Y+YAQK2UREEyZVU=; b=owGbwMvMwCV2fu7ZrsZH9SKMp9WSGLKy9H5sVEjI4ry+rvqR/BF2zY0GNmF9lntStlrISS6ey x7GvCqlo5SFQYyLQVZMkeX5F/H9QSJh8zov+LvBzGFlAhnCwMUpABPZ+ZLhn1lQ/tmWn+5fohmu q7hUKvuVMc7I3eh2rDMqXutq2Oni9YwMe7YsnPGrRuP4H8nJUzl+reTVu/Ts5OZ+3c6Z4UH7W/7 P4wAA X-Developer-Key: i=ljs@kernel.org; a=openpgp; fpr=E7F417BF5214569E89D04F46CF9DCD8A81E27F14 X-Rspam-User: X-Rspamd-Queue-Id: CBA612000B X-Rspamd-Server: rspam01 X-Stat-Signature: 15436au5ixpdnc5dwon57azs1mo9qtso X-HE-Tag: 1785343790-494929 X-HE-Meta: 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 PT2cOJlM ijOuaYR9KFWxpTg681HF2irUz0/onG4zI26xkkq/yszCqIiRwW+jWuyMdpqi8QtL2AY69UFGfQt8Kw4UjA5yq9VT51uAdlMbU1s6LqZXM9YwM6ovivN+Q1qzsm9mew3IhOUx8/YgBtHfOYv4vWGhYomlFTZ4syeMhAYj9AWUU89x7EMum50YFaqVrkNOINeujnJ7UcKmARJfUwS9nj9w7exc0xE/4xtzSEjRmpxH02liizDHH8tRanQ1wVGnOqcrSr5RqYjcN0SgpYycoiFLFYvbCalJaMcIAIGcAzF8F8+4g7F9hUPaD39EfZsNnjqueW68KJHeV6qngJlQMs3yp2fSWduDnVWpBvi4mBth1otnYaVakenq0IYdzLA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: In cases where we know that the VMA is file-backed, use vma_filebacked_address() rather than vma_address(). This lays the foundation for using the anonymous page offset via vma_anon_address(). Also add an assert to ensure that the VMA whose address is required is not anonymous. No functional change intended. Signed-off-by: Lorenzo Stoakes (ARM) --- mm/internal.h | 18 ++++++++++++++++++ mm/memory-failure.c | 4 ++-- mm/page_vma_mapped.c | 6 +++++- mm/rmap.c | 10 ++++++---- 4 files changed, 31 insertions(+), 7 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 0d11eb8e615f..920872904bda 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -1025,6 +1025,24 @@ static inline unsigned long __vma_address(const struct vm_area_struct *vma, return address; } +/** + * vma_filebacked_address - Find the virtual address a file-backed page range is + * mapped at. + * @vma: The vma which maps this object. + * @pgoff: The page offset within its object. + * @nr_pages: The number of pages to consider. + * + * Returns: If any page in this range is mapped by this VMA, return the first + * address where any of these pages appear. Otherwise, return -EFAULT. + */ +static inline unsigned long vma_filebacked_address(const struct vm_area_struct *vma, + pgoff_t pgoff, unsigned long nr_pages) +{ + VM_WARN_ON_ONCE(vma_is_anonymous(vma)); + + return __vma_address(vma, pgoff, vma_start_pgoff(vma), nr_pages); +} + /** * vma_address - Find the virtual address a page range is mapped at. * @vma: The vma which maps this object. diff --git a/mm/memory-failure.c b/mm/memory-failure.c index aaf14608b30e..a8b03e2920ba 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -620,7 +620,7 @@ static void add_to_kill_fsdax(struct task_struct *tsk, const struct page *p, struct vm_area_struct *vma, struct list_head *to_kill, pgoff_t pgoff) { - unsigned long addr = vma_address(vma, pgoff, 1); + unsigned long addr = vma_filebacked_address(vma, pgoff, 1); __add_to_kill(tsk, p, vma, to_kill, addr); } @@ -2265,7 +2265,7 @@ static void add_to_kill_pgoff(struct task_struct *tsk, } /* Check for pgoff not backed by struct page */ - tk->addr = vma_address(vma, pgoff, 1); + tk->addr = vma_filebacked_address(vma, pgoff, 1); tk->size_shift = PAGE_SHIFT; if (tk->addr == -EFAULT) diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index d7670ba4147b..081e483cc7bf 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -356,6 +356,7 @@ unsigned long page_mapped_in_vma(const struct page *page, struct vm_area_struct *vma) { const struct folio *folio = page_folio(page); + const pgoff_t pgoff = page_pgoff(folio, page); struct page_vma_mapped_walk pvmw = { .pfn = page_to_pfn(page), .nr_pages = 1, @@ -363,7 +364,10 @@ unsigned long page_mapped_in_vma(const struct page *page, .flags = PVMW_SYNC, }; - pvmw.address = vma_address(vma, page_pgoff(folio, page), 1); + if (folio_test_anon(folio)) + pvmw.address = vma_address(vma, pgoff, 1); + else + pvmw.address = vma_filebacked_address(vma, pgoff, 1); if (pvmw.address == -EFAULT) goto out; if (!page_vma_mapped_walk(&pvmw)) diff --git a/mm/rmap.c b/mm/rmap.c index ad820fe86f7d..5798427d007f 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -865,14 +865,15 @@ unsigned long page_address_in_vma(const struct folio *folio, if (!vma->anon_vma || !anon_vma || vma->anon_vma->root != anon_vma->root) return -EFAULT; + /* KSM folios don't reach here because of the !anon_vma check */ + return vma_address(vma, page_pgoff(folio, page), 1); } else if (!vma->vm_file) { return -EFAULT; } else if (vma->vm_file->f_mapping != folio->mapping) { return -EFAULT; } - /* KSM folios don't reach here because of the !anon_vma check */ - return vma_address(vma, page_pgoff(folio, page), 1); + return vma_filebacked_address(vma, page_pgoff(folio, page), 1); } /* @@ -1321,7 +1322,7 @@ int pfn_mkclean_range(unsigned long pfn, unsigned long nr_pages, pgoff_t pgoff, if (invalid_mkclean_vma(vma, NULL)) return 0; - pvmw.address = vma_address(vma, pgoff, nr_pages); + pvmw.address = vma_filebacked_address(vma, pgoff, nr_pages); VM_BUG_ON_VMA(pvmw.address == -EFAULT, vma); return page_vma_mkclean_one(&pvmw); @@ -3100,7 +3101,8 @@ static void __rmap_walk_file(struct folio *folio, struct address_space *mapping, } lookup: mapping_rmap_tree_foreach(vma, mapping, pgoff_start, pgoff_end) { - unsigned long address = vma_address(vma, pgoff_start, nr_pages); + unsigned long address = vma_filebacked_address(vma, pgoff_start, + nr_pages); VM_BUG_ON_VMA(address == -EFAULT, vma); cond_resched(); -- 2.55.0