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-rw-r--r--include/linux/suspend.h6
-rw-r--r--kernel/power/power.h12
-rw-r--r--kernel/power/swsusp.c2
3 files changed, 12 insertions, 8 deletions
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 3aecc96acc7..96868be9c21 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -52,10 +52,4 @@ struct saved_context;
void __save_processor_state(struct saved_context *ctxt);
void __restore_processor_state(struct saved_context *ctxt);
-/*
- * XXX: We try to keep some more pages free so that I/O operations succeed
- * without paging. Might this be more?
- */
-#define PAGES_FOR_IO 1024
-
#endif /* _LINUX_SWSUSP_H */
diff --git a/kernel/power/power.h b/kernel/power/power.h
index a3e47cbdaf3..34b43542785 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -14,8 +14,18 @@ struct swsusp_info {
#ifdef CONFIG_SOFTWARE_SUSPEND
-extern int pm_suspend_disk(void);
+/*
+ * Keep some memory free so that I/O operations can succeed without paging
+ * [Might this be more than 4 MB?]
+ */
+#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
+/*
+ * Keep 1 MB of memory free so that device drivers can allocate some pages in
+ * their .suspend() routines without breaking the suspend to disk.
+ */
+#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
+extern int pm_suspend_disk(void);
#else
static inline int pm_suspend_disk(void)
{
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 1109023d835..5da304c8f1f 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -233,7 +233,7 @@ int swsusp_shrink_memory(void)
long size, highmem_size;
highmem_size = count_highmem_pages();
- size = count_data_pages() + PAGES_FOR_IO;
+ size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
tmp = size;
size += highmem_size;
for_each_zone (zone)