The quilt patch titled Subject: mm: convert page_to_pgoff() to page_pgoff() has been removed from the -mm tree. Its filename was mm-convert-page_to_pgoff-to-page_pgoff.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> Subject: mm: convert page_to_pgoff() to page_pgoff() Date: Sat, 5 Oct 2024 21:01:12 +0100 Patch series "page->index removals in mm", v2. As part of shrinking struct page, we need to stop using page->index. This patchset gets rid of most of the remaining references to page->index in mm, as well as increasing the number of functions which take a const folio/page pointer. It shrinks the text segment of mm by a few hundred bytes in my test config, probably mostly from removing calls to compound_head() in page_to_pgoff(). This patch (of 7): Change the function signature to pass in the folio as all three callers have it. This removes a reference to page->index, which we're trying to get rid of. And add kernel-doc. Link: https://lkml.kernel.org/r/20241005200121.3231142-1-willy@xxxxxxxxxxxxx Link: https://lkml.kernel.org/r/20241005200121.3231142-2-willy@xxxxxxxxxxxxx Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/mm.h | 2 +- include/linux/pagemap.h | 31 +++++++++++++++++-------------- mm/memory-failure.c | 4 ++-- mm/rmap.c | 2 +- 4 files changed, 21 insertions(+), 18 deletions(-) --- a/include/linux/mm.h~mm-convert-page_to_pgoff-to-page_pgoff +++ a/include/linux/mm.h @@ -1895,7 +1895,7 @@ static inline unsigned long page_to_sect * * Return: The Page Frame Number of the first page in the folio. */ -static inline unsigned long folio_pfn(struct folio *folio) +static inline unsigned long folio_pfn(const struct folio *folio) { return page_to_pfn(&folio->page); } --- a/include/linux/pagemap.h~mm-convert-page_to_pgoff-to-page_pgoff +++ a/include/linux/pagemap.h @@ -1011,22 +1011,25 @@ static inline struct folio *read_mapping return read_cache_folio(mapping, index, NULL, file); } -/* - * Get the offset in PAGE_SIZE (even for hugetlb pages). +/** + * page_pgoff - Calculate the logical page offset of this page. + * @folio: The folio containing this page. + * @page: The page which we need the offset of. + * + * For file pages, this is the offset from the beginning of the file + * in units of PAGE_SIZE. For anonymous pages, this is the offset from + * the beginning of the anon_vma in units of PAGE_SIZE. This will + * return nonsense for KSM pages. + * + * Context: Caller must have a reference on the folio or otherwise + * prevent it from being split or freed. + * + * Return: The offset in units of PAGE_SIZE. */ -static inline pgoff_t page_to_pgoff(struct page *page) +static inline pgoff_t page_pgoff(const struct folio *folio, + const struct page *page) { - struct page *head; - - if (likely(!PageTransTail(page))) - return page->index; - - head = compound_head(page); - /* - * We don't initialize ->index for tail pages: calculate based on - * head page - */ - return head->index + page - head; + return folio->index + folio_page_idx(folio, page); } /* --- a/mm/memory-failure.c~mm-convert-page_to_pgoff-to-page_pgoff +++ a/mm/memory-failure.c @@ -617,7 +617,7 @@ static void collect_procs_anon(struct fo if (av == NULL) /* Not actually mapped anymore */ return; - pgoff = page_to_pgoff(page); + pgoff = page_pgoff(folio, page); rcu_read_lock(); for_each_process(tsk) { struct vm_area_struct *vma; @@ -653,7 +653,7 @@ static void collect_procs_file(struct fo i_mmap_lock_read(mapping); rcu_read_lock(); - pgoff = page_to_pgoff(page); + pgoff = page_pgoff(folio, page); for_each_process(tsk) { struct task_struct *t = task_early_kill(tsk, force_early); unsigned long addr; --- a/mm/rmap.c~mm-convert-page_to_pgoff-to-page_pgoff +++ a/mm/rmap.c @@ -1276,7 +1276,7 @@ static void __page_check_anon_rmap(struc */ VM_BUG_ON_FOLIO(folio_anon_vma(folio)->root != vma->anon_vma->root, folio); - VM_BUG_ON_PAGE(page_to_pgoff(page) != linear_page_index(vma, address), + VM_BUG_ON_PAGE(page_pgoff(folio, page) != linear_page_index(vma, address), page); } _ Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are