lib: add generic strnlen_user() function
This adds a new generic optimized strnlen_user() function that uses the
<asm/word-at-a-time.h> infrastructure to portably do efficient string
handling.
In many ways, strnlen is much simpler than strncpy, and in particular we
can always pre-align the words we load from memory. That means that all
the worries about alignment etc are a non-issue, so this one can easily
be used on any architecture. You obviously do have to do the
appropriate word-at-a-time.h macros.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/Kconfig b/lib/Kconfig
index 98230ac..64ddc44 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -19,6 +19,9 @@
config GENERIC_STRNCPY_FROM_USER
bool
+config GENERIC_STRNLEN_USER
+ bool
+
config GENERIC_FIND_FIRST_BIT
bool