PM / Hibernate: Add sysfs knob to control size of memory for drivers

[deliverable/linux.git] / kernel / power / hibernate.c

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 50aae660174d6bd0b0697b6a70e4e31b2e1535f3..431721313b71fa44bbbbc7b6c291562076252c1e 100644 (file)
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -982,10 +982,33 @@ static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *att
 
 power_attr(image_size);
 
+static ssize_t reserved_size_show(struct kobject *kobj,
+                                 struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%lu\n", reserved_size);
+}
+
+static ssize_t reserved_size_store(struct kobject *kobj,
+                                  struct kobj_attribute *attr,
+                                  const char *buf, size_t n)
+{
+       unsigned long size;
+
+       if (sscanf(buf, "%lu", &size) == 1) {
+               reserved_size = size;
+               return n;
+       }
+
+       return -EINVAL;
+}
+
+power_attr(reserved_size);
+
 static struct attribute * g[] = {
        &disk_attr.attr,
        &resume_attr.attr,
        &image_size_attr.attr,
+       &reserved_size_attr.attr,
        NULL,
 };