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futex: Allow for compiling out PI support

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This makes it possible to preserve basic futex support and compile out the
PI support when RT mutexes are not available.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Darren Hart <dvhart@infradead.org>
Link: http://lkml.kernel.org/r/alpine.LFD.2.20.1708010024190.5981@knanqh.ubzr
This commit is contained in:
Nicolas Pitre
2017-08-01 00:31:32 -04:00
committed by Thomas Gleixner
parent f06e8c584f
commit bc2eecd7ec
4 changed files with 63 additions and 2 deletions
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init/Kconfig
+6 -1
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@@ -1275,12 +1275,17 @@ config BASE_FULL
config FUTEX
bool "Enable futex support" if EXPERT
default y
select RT_MUTEXES
imply RT_MUTEXES
help
Disabling this option will cause the kernel to be built without
support for "fast userspace mutexes". The resulting kernel may not
run glibc-based applications correctly.
config FUTEX_PI
bool
depends on FUTEX && RT_MUTEXES
default y
config HAVE_FUTEX_CMPXCHG
bool
depends on FUTEX