Make shrink_all_memory() overflow-resistant.
Signed-off-by: Rafael J. Wysocki <[email protected]>
---
include/linux/swap.h | 2 +-
mm/vmscan.c | 9 +++++----
2 files changed, 6 insertions(+), 5 deletions(-)
Index: linux-2.6.16-rc4-mm2/mm/vmscan.c
===================================================================
--- linux-2.6.16-rc4-mm2.orig/mm/vmscan.c
+++ linux-2.6.16-rc4-mm2/mm/vmscan.c
@@ -1785,18 +1785,19 @@ void wakeup_kswapd(struct zone *zone, in
* Try to free `nr_pages' of memory, system-wide. Returns the number of freed
* pages.
*/
-int shrink_all_memory(unsigned long nr_pages)
+unsigned long shrink_all_memory(unsigned int nr_pages)
{
pg_data_t *pgdat;
- unsigned long nr_to_free = nr_pages;
- int ret = 0;
+ long long nr_to_free = nr_pages;
+ unsigned long ret = 0;
struct reclaim_state reclaim_state = {
.reclaimed_slab = 0,
};
current->reclaim_state = &reclaim_state;
for_each_pgdat(pgdat) {
- int freed;
+ unsigned long freed;
+
freed = balance_pgdat(pgdat, nr_to_free, 0);
ret += freed;
nr_to_free -= freed;
Index: linux-2.6.16-rc4-mm2/include/linux/swap.h
===================================================================
--- linux-2.6.16-rc4-mm2.orig/include/linux/swap.h
+++ linux-2.6.16-rc4-mm2/include/linux/swap.h
@@ -173,7 +173,7 @@ extern void swap_setup(void);
/* linux/mm/vmscan.c */
extern unsigned long try_to_free_pages(struct zone **, gfp_t);
-extern int shrink_all_memory(unsigned long nr_pages);
+extern unsigned long shrink_all_memory(unsigned int nr_pages);
extern int vm_swappiness;
#ifdef CONFIG_NUMA
-
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