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authorDavid Shaohua Li <shaohua.li@intel.com>2005-03-18 16:27:13 -0500
committerLen Brown <len.brown@intel.com>2005-07-11 23:21:54 -0400
commit5ae947ecc9c1c23834201e5321684a5cb68bdd3f (patch)
tree2d6b2df724d5973eb9baeae70cf3742639404021 /kernel
parente2a5b420f716cd1a46674b1a90389612eced916f (diff)
[ACPI] Suspend to RAM fix
Free some RAM before entering S3 so that upon resume we can be sure early allocations will succeed. http://bugzilla.kernel.org/show_bug.cgi?id=3469 Signed-off-by: David Shaohua Li <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/main.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index c7eb4a833db..454434716f3 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -19,6 +19,9 @@
#include "power.h"
+/*This is just an arbitrary number */
+#define FREE_PAGE_NUMBER (100)
+
DECLARE_MUTEX(pm_sem);
struct pm_ops * pm_ops = NULL;
@@ -49,6 +52,7 @@ void pm_set_ops(struct pm_ops * ops)
static int suspend_prepare(suspend_state_t state)
{
int error = 0;
+ unsigned int free_pages;
if (!pm_ops || !pm_ops->enter)
return -EPERM;
@@ -60,6 +64,16 @@ static int suspend_prepare(suspend_state_t state)
goto Thaw;
}
+ if ((free_pages = nr_free_pages()) < FREE_PAGE_NUMBER) {
+ pr_debug("PM: free some memory\n");
+ shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
+ if (nr_free_pages() < FREE_PAGE_NUMBER) {
+ error = -ENOMEM;
+ printk(KERN_ERR "PM: No enough memory\n");
+ goto Thaw;
+ }
+ }
+
if (pm_ops->prepare) {
if ((error = pm_ops->prepare(state)))
goto Thaw;