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| author | Vishal Moola (Oracle) <vishal.moola@gmail.com> | 2023-01-31 00:43:49 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-14 02:54:31 +0300 |
| commit | 3c1ea2c729ef8ef07bcb80d01ab2ead45b3406dd (patch) | |
| tree | cc98b8ca8028bb49bb76e4abe203edce6cc79ff4 /include | |
| parent | 4a64981dfee9119aa2c1f243b48f34cbbd67779c (diff) | |
| download | linux-3c1ea2c729ef8ef07bcb80d01ab2ead45b3406dd.tar.xz | |
mm: add folio_get_nontail_page()
Patch series "Convert a couple migrate functions to use folios", v2.
This patchset introduces folio_movable_ops() and converts 3 functions in
mm/migrate.c to use folios. It also introduces folio_get_nontail_page()
for folio conversions which may want to distinguish between head and tail
pages.
This patch (of 4):
folio_get_nontail_page() returns the folio associated with a head page.
This is necessary for folio conversions where the behavior of that
function differs between head pages and tail pages.
Link: https://lkml.kernel.org/r/20230130214352.40538-1-vishal.moola@gmail.com
Link: https://lkml.kernel.org/r/20230130214352.40538-2-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 89c118ad4a44..2992a2d55aee 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -892,6 +892,13 @@ static inline bool get_page_unless_zero(struct page *page) return page_ref_add_unless(page, 1, 0); } +static inline struct folio *folio_get_nontail_page(struct page *page) +{ + if (unlikely(!get_page_unless_zero(page))) + return NULL; + return (struct folio *)page; +} + extern int page_is_ram(unsigned long pfn); enum { |