From fb30db43c43f75ed0a1db1270f6e9cc0ddf373b6 Mon Sep 17 00:00:00 2001
From: David Shaohua Li <shaohua.li@intel.com>
Date: Fri, 18 Mar 2005 16:27:13 -0500
Subject: [PATCH] --- yaml --- r: 4712 b: refs/heads/master c:
 5ae947ecc9c1c23834201e5321684a5cb68bdd3f h: refs/heads/master v: v3

---
 [refs]                    |  2 +-
 trunk/kernel/power/main.c | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 20afc02b07dd..d32f2bcaa3c4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e2a5b420f716cd1a46674b1a90389612eced916f
+refs/heads/master: 5ae947ecc9c1c23834201e5321684a5cb68bdd3f
diff --git a/trunk/kernel/power/main.c b/trunk/kernel/power/main.c
index c7eb4a833db5..454434716f35 100644
--- a/trunk/kernel/power/main.c
+++ b/trunk/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;