diff options
| author | Matteo Croce <mcroce@microsoft.com> | 2021-06-07 21:02:36 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-06-07 14:11:47 -0700 |
| commit | c07aea3ef4d4076f18f567b98ed01e082e02ed51 (patch) | |
| tree | f52beca6a7fefeb1f14f7fb92efa914a3682b86f /include/linux/mm_types.h | |
| parent | 35cba15a504bf4f585bb9d78f47b22b28a1a06b2 (diff) | |
mm: add a signature in struct page
This is needed by the page_pool to avoid recycling a page not allocated
via page_pool.
The page->signature field is aliased to page->lru.next and
page->compound_head, but it can't be set by mistake because the
signature value is a bad pointer, and can't trigger a false positive
in PageTail() because the last bit is 0.
Co-developed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 5aacc1c10a45..ed6862eacb52 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -97,6 +97,13 @@ struct page { }; struct { /* page_pool used by netstack */ /** + * @pp_magic: magic value to avoid recycling non + * page_pool allocated pages. + */ + unsigned long pp_magic; + struct page_pool *pp; + unsigned long _pp_mapping_pad; + /** * @dma_addr: might require a 64-bit value on * 32-bit architectures. */ |