diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-12-11 16:22:10 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 11:58:26 -0800 |
| commit | b2926ac8178bf5c88ada4285f413f56c1cafc592 (patch) | |
| tree | e18a81fd73f42397f38fd51914fc7570fe6f8675 | |
| parent | 2853b66b601a265306be709b4d86aaff7d92a0fc (diff) | |
mm: remove stale example from comment
folio_add_new_anon_rmap() no longer works this way, so just remove the
entire example.
Link: https://lkml.kernel.org/r/20231211162214.2146080-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/memremap.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/mm/memremap.c b/mm/memremap.c index 9531faa92a7c..9e9fb1972fff 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -473,21 +473,11 @@ void free_zone_device_page(struct page *page) __ClearPageAnonExclusive(page); /* - * When a device managed page is freed, the page->mapping field + * When a device managed page is freed, the folio->mapping field * may still contain a (stale) mapping value. For example, the - * lower bits of page->mapping may still identify the page as an - * anonymous page. Ultimately, this entire field is just stale - * and wrong, and it will cause errors if not cleared. One - * example is: - * - * migrate_vma_pages() - * migrate_vma_insert_page() - * page_add_new_anon_rmap() - * __page_set_anon_rmap() - * ...checks page->mapping, via PageAnon(page) call, - * and incorrectly concludes that the page is an - * anonymous page. Therefore, it incorrectly, - * silently fails to set up the new anon rmap. + * lower bits of folio->mapping may still identify the folio as an + * anonymous folio. Ultimately, this entire field is just stale + * and wrong, and it will cause errors if not cleared. * * For other types of ZONE_DEVICE pages, migration is either * handled differently or not done at all, so there is no need |