aboutsummaryrefslogtreecommitdiff
path: root/kernel/power/power.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r--kernel/power/power.h12
1 files changed, 11 insertions, 1 deletions
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)
{