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-rw-r--r--lib/string.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
index cdd97f4..ce81aae 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -596,6 +596,11 @@ EXPORT_SYMBOL(memset);
* @s: Pointer to the start of the area.
* @count: The size of the area.
*
+ * Note: usually using memset() is just fine (!), but in cases
+ * where clearing out _local_ data at the end of a scope is
+ * necessary, memzero_explicit() should be used instead in
+ * order to prevent the compiler from optimising away zeroing.
+ *
* memzero_explicit() doesn't need an arch-specific version as
* it just invokes the one of memset() implicitly.
*/

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