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 <heiko.carstens@de.ibm.com>
Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/20140302120947.GA3641@osiris
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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This commit is contained in:

Heiko Carstens 2014-03-02 13:09:47 +01:00 • committed by Thomas Gleixner

parent d2ae2e525e

commit 03b8c7b623

4 changed files with 36 additions and 13 deletions

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1

arch/s390/Kconfig

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4

include/linux/futex.h

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7

init/Kconfig

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37

kernel/futex.c

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