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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-09-13 11:14:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-09-13 11:14:53 -0700 |
| commit | 72d931046030beb2d13dad6d205be0e228618432 (patch) | |
| tree | 2a1f26ae904f9476b4269ff0d9a677580d0c8c9b /lib/Kconfig | |
| parent | 186cec317e87b85b296713426fa39eaa41ec6056 (diff) | |
| download | lwn-72d931046030beb2d13dad6d205be0e228618432.tar.gz lwn-72d931046030beb2d13dad6d205be0e228618432.zip | |
Make ARCH_HAS_FAST_MULTIPLIER a real config variable
It used to be an ad-hoc hack defined by the x86 version of
<asm/bitops.h> that enabled a couple of library routines to know whether
an integer multiply is faster than repeated shifts and additions.
This just makes it use the real Kconfig system instead, and makes x86
(which was the only architecture that did this) select the option.
NOTE! Even for x86, this really is kind of wrong. If we cared, we would
probably not enable this for builds optimized for netburst (P4), where
shifts-and-adds are generally faster than multiplies. This patch does
*not* change that kind of logic, though, it is purely a syntactic change
with no code changes.
This was triggered by the fact that we have other places that really
want to know "do I want to expand multiples by constants by hand or
not", particularly the hash generation code.
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 a5ce0c7f6c30..54cf309a92a5 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -51,6 +51,9 @@ config PERCPU_RWSEM config ARCH_USE_CMPXCHG_LOCKREF bool +config ARCH_HAS_FAST_MULTIPLIER + bool + config CRC_CCITT tristate "CRC-CCITT functions" help |