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futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() test

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If an architecture has futex_atomic_cmpxchg_inatomic() implemented and there
is no runtime check necessary, allow to skip the test within futex_init().

This allows to get rid of some code which would always give the same result,
and also allows the compiler to optimize a couple of if statements away.

Signed-off-by: Heiko Carstens <[email protected]>
Cc: Finn Thain <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Link: http://lkml.kernel.org/r/20140302120947.GA3641@osiris
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Heiko Carstens 2014-03-02 13:09:47 +01:00 • committed by Thomas Gleixner
commit 03b8c7b623
4 changed files with 36 additions and 13 deletions
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7
init/Kconfig
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@ -1387,6 +1387,13 @@ config FUTEX
support for "fast userspace mutexes". The resulting kernel may not
run glibc-based applications correctly.
config HAVE_FUTEX_CMPXCHG
bool
help
Architectures should select this if futex_atomic_cmpxchg_inatomic()
is implemented and always working. This removes a couple of runtime
checks.
config EPOLL
bool "Enable eventpoll support" if EXPERT
default y