diff options
| author | Hugh Dickins <hughd@google.com> | 2021-07-07 13:06:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-11 15:05:15 -0700 |
| commit | 64b586d1922384710de2ce3c8c67e7ea0b6ffb57 (patch) | |
| tree | 714c3f3f14df62de8bddaf6a8c532ce72e85b58a /mm | |
| parent | 98f7fdced2e0efb1599a37b3e57671a7884f3a25 (diff) | |
| download | linux-64b586d1922384710de2ce3c8c67e7ea0b6ffb57.tar.bz2 | |
mm/rmap: fix comments left over from recent changes
Parallel developments in mm/rmap.c have left behind some out-of-date
comments: try_to_migrate_one() also accepts TTU_SYNC (already commented
in try_to_migrate() itself), and try_to_migrate() returns nothing at
all.
TTU_SPLIT_FREEZE has just been deleted, so reword the comment about it
in mm/huge_memory.c; and TTU_IGNORE_ACCESS was removed in 5.11, so
delete the "recently referenced" comment from try_to_unmap_one() (once
upon a time the comment was near the removed codeblock, but they drifted
apart).
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Link: https://lore.kernel.org/lkml/563ce5b2-7a44-5b4d-1dfd-59a0e65932a9@google.com/
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/huge_memory.c | 2 | ||||
| -rw-r--r-- | mm/rmap.c | 7 |
2 files changed, 2 insertions, 7 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8b731d53e9f4..afff3ac87067 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2331,7 +2331,7 @@ static void remap_page(struct page *page, unsigned int nr) { int i; - /* If TTU_SPLIT_FREEZE is ever extended to file, remove this check */ + /* If unmap_page() uses try_to_migrate() on file, remove this check */ if (!PageAnon(page)) return; if (PageTransHuge(page)) { diff --git a/mm/rmap.c b/mm/rmap.c index 37c24672125c..746013e282c3 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1439,8 +1439,6 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, while (page_vma_mapped_walk(&pvmw)) { /* * If the page is mlock()d, we cannot swap it out. - * If it's recently referenced (perhaps page_referenced - * skipped over this mm) then we should reactivate it. */ if (!(flags & TTU_IGNORE_MLOCK)) { if (vma->vm_flags & VM_LOCKED) { @@ -1687,8 +1685,7 @@ void try_to_unmap(struct page *page, enum ttu_flags flags) * @arg: enum ttu_flags will be passed to this argument. * * If TTU_SPLIT_HUGE_PMD is specified any PMD mappings will be split into PTEs - * containing migration entries. This and TTU_RMAP_LOCKED are the only supported - * flags. + * containing migration entries. */ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma, unsigned long address, void *arg) @@ -1928,8 +1925,6 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma, * * Tries to remove all the page table entries which are mapping this page and * replace them with special swap entries. Caller must hold the page lock. - * - * If is successful, return true. Otherwise, false. */ void try_to_migrate(struct page *page, enum ttu_flags flags) { |