1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 656295865d58..91812df1351a 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -368,9 +368,25 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
 void drain_all_pages(void);
 void drain_local_pages(void *dummy);
 
+/*
+ * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
+ * GFP flags are used before interrupts are enabled. Once interrupts are
+ * enabled, it is set to __GFP_BITS_MASK while the system is running. During
+ * hibernation, it is used by PM to avoid I/O during memory allocation while
+ * devices are suspended.
+ */
 extern gfp_t gfp_allowed_mask;
 
 extern void pm_restrict_gfp_mask(void);
 extern void pm_restore_gfp_mask(void);
 
+#ifdef CONFIG_PM_SLEEP
+extern bool pm_suspended_storage(void);
+#else
+static inline bool pm_suspended_storage(void)
+{
+        return false;
+}
+#endif /* CONFIG_PM_SLEEP */
+
 #endif /* __LINUX_GFP_H */