[PATCH] mm: page_state fixes

read_page_state and __get_page_state only traverse online CPUs, which will
cause results to fluctuate when CPUs are plugged in or out.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7cff958e7813..379618747deb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1169,12 +1169,11 @@ EXPORT_SYMBOL(nr_pagecache);
 DEFINE_PER_CPU(long, nr_pagecache_local) = 0;
 #endif
 
-void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
+static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
 {
         int cpu = 0;
 
         memset(ret, 0, sizeof(*ret));
-        cpus_and(*cpumask, *cpumask, cpu_online_map);
 
         cpu = first_cpu(*cpumask);
         while (cpu < NR_CPUS) {
@@ -1227,7 +1226,7 @@ unsigned long __read_page_state(unsigned long offset)
         unsigned long ret = 0;
         int cpu;
 
-        for_each_online_cpu(cpu) {
+        for_each_cpu(cpu) {
                 unsigned long in;
 
                 in = (unsigned long)&per_cpu(page_states, cpu) + offset;