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lib: memzero_explicit: add comment for its usage 

Lets improve the comment to add a note on when to use memzero_explicit()
for those not digging through the git logs. We don't want people to
pollute places with memzero_explicit() where it's not really necessary.

Reference: https://lkml.org/lkml/2015/1/4/190
Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Daniel Borkmann 2015-01-06 00:27:45 +01:00 committed by Herbert Xu
parent ad511e260a
commit 8155330aad
1 changed files with 5 additions and 0 deletions
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lib/string.c
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@ -604,6 +604,11 @@ EXPORT_SYMBOL(memset);
* @s: Pointer to the start of the area. * @s: Pointer to the start of the area.
* @count: The size 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 * memzero_explicit() doesn't need an arch-specific version as
* it just invokes the one of memset() implicitly. * it just invokes the one of memset() implicitly.
*/ */