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[05/32] mm: Provide lru_to_last_page() to get last of a page list

Message ID 159465789337.1376674.4843292427395367970.stgit@warthog.procyon.org.uk (mailing list archive)
State New, archived
Headers show
Series fscache: Rewrite 2: Make the I/O interface use kiocb/iov_iter | expand

Commit Message

David Howells July 13, 2020, 4:31 p.m. UTC 
Provide a macro, lru_to_last_page(), to find the last page in a page list
(the opposite of lru_to_page()).

Signed-off-by: David Howells <dhowells@redhat.com>
---

 include/linux/mm.h |    1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/include/linux/mm.h b/include/linux/mm.h
index dc7b87310c10..9692b9b58b06 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -216,6 +216,7 @@  int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *,
 #define PAGE_ALIGNED(addr)	IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
 
 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
+#define lru_to_last_page(head) (list_entry((head)->next, struct page, lru))
 
 /*
  * Linux kernel virtual memory manager primitives.