Merge tag 'nfs-for-3.18-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

[firefly-linux-kernel-4.4.55.git] / lib / string.c

diff --git a/lib/string.c b/lib/string.c
index 2fc20aa06f848fcebd8aa30d238942f5ec399690..10063300b83009dfcdc08988d640fc191481dde5 100644 (file)
--- a/lib/string.c
+++ b/lib/string.c
@@ -598,6 +598,22 @@ void *memset(void *s, int c, size_t count)
 EXPORT_SYMBOL(memset);
 #endif
 
+/**
+ * memzero_explicit - Fill a region of memory (e.g. sensitive
+ *                   keying data) with 0s.
+ * @s: Pointer to the start of the area.
+ * @count: The size of the area.
+ *
+ * memzero_explicit() doesn't need an arch-specific version as
+ * it just invokes the one of memset() implicitly.
+ */
+void memzero_explicit(void *s, size_t count)
+{
+       memset(s, 0, count);
+       OPTIMIZER_HIDE_VAR(s);
+}
+EXPORT_SYMBOL(memzero_explicit);
+
 #ifndef __HAVE_ARCH_MEMCPY
 /**
  * memcpy - Copy one area of memory to another