[patch][rfc] 1/5: comment for mm/rmap.c

[Nick Piggin <nickpiggin@yahoo.com.au>]

[-- Attachment #1: Type: text/plain, Size: 4 bytes --]

1/5

[-- Attachment #2: mm-comment-rmap.patch --]
[-- Type: text/plain, Size: 709 bytes --]

Just be clear that VM_RESERVED pages here are a bug, and the test
is not there because they are expected.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/mm/rmap.c
===================================================================
--- linux-2.6.orig/mm/rmap.c
+++ linux-2.6/mm/rmap.c
@@ -532,6 +532,8 @@ static int try_to_unmap_one(struct page 
 	 * 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.
+	 *
+	 * Pages belonging to VM_RESERVED regions should not happen here.
 	 */
 	if ((vma->vm_flags & (VM_LOCKED|VM_RESERVED)) ||
 			ptep_clear_flush_young(vma, address, pte)) {