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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-26 11:06:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-26 11:33:53 -0700 |
| commit | a08c5356a3aaf638c41897ae4169de18db89595e (patch) | |
| tree | fe0d1cb48a26cc000c199d484a139799d559a178 /lib/Kconfig | |
| parent | 36126f8f2ed8168eb13aa0662b9b9585cba100a9 (diff) | |
| download | lwn-a08c5356a3aaf638c41897ae4169de18db89595e.tar.gz lwn-a08c5356a3aaf638c41897ae4169de18db89595e.zip | |
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>
Diffstat (limited to 'lib/Kconfig')
| -rw-r--r-- | lib/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index 98230ac3db29..64ddc44d0b81 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -19,6 +19,9 @@ config RATIONAL config GENERIC_STRNCPY_FROM_USER bool +config GENERIC_STRNLEN_USER + bool + config GENERIC_FIND_FIRST_BIT bool |