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authorMike Frysinger <vapier@gentoo.org>2009-06-23 12:37:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-23 12:50:05 -0700
commit01ff53f416757da416413bc32229770a8448b6ef (patch)
tree31374589a0a6116ff3d756137fa0b0ac87f49e2e /include/linux/rmap.h
parenta5c9b696ec109bb54d547fdb437a7a0c2d514670 (diff)
rmap: fixup page_referenced() for nommu systems
After the recent changes that went into mm/vmscan.c to overhaul stuff, we ended up with these warnings on no-mmu systems: mm/vmscan.c: In function `shrink_page_list': mm/vmscan.c:580: warning: unused variable `vm_flags' mm/vmscan.c: In function `shrink_active_list': mm/vmscan.c:1294: warning: `vm_flags' may be used uninitialized in this function mm/vmscan.c:1242: note: `vm_flags' was declared here This is because the no-mmu function defines page_referenced() to work on the first argument only (the page). It does not clear the vm_flags given to it because for no-mmu systems, they never actually get utilized. Since that is no longer strictly true, we need to set vm_flags to 0 like everyone else so gcc can do proper dead code elimination without annoying us with unused warnings. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: David Howells <dhowells@redhat.com> Acked-by: David McCullough <davidm@snapgear.com> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/rmap.h')
-rw-r--r--include/linux/rmap.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 216d024f830..bf116d0dbf2 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -118,7 +118,14 @@ int try_to_munlock(struct page *);
#define anon_vma_prepare(vma) (0)
#define anon_vma_link(vma) do {} while (0)
-#define page_referenced(page, locked, cnt, flags) TestClearPageReferenced(page)
+static inline int page_referenced(struct page *page, int is_locked,
+ struct mem_cgroup *cnt,
+ unsigned long *vm_flags)
+{
+ *vm_flags = 0;
+ return TestClearPageReferenced(page);
+}
+
#define try_to_unmap(page, refs) SWAP_FAIL
static inline int page_mkclean(struct page *page)