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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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7
include/linux/futex.h
View file

@ -54,7 +54,6 @@ union futex_key {
#ifdef CONFIG_FUTEX
extern void exit_robust_list(struct task_struct *curr);
extern void exit_pi_state_list(struct task_struct *curr);
#ifdef CONFIG_HAVE_FUTEX_CMPXCHG
#define futex_cmpxchg_enabled 1
#else
@ -64,8 +63,14 @@ extern int futex_cmpxchg_enabled;
static inline void exit_robust_list(struct task_struct *curr)
{
}
#endif
#ifdef CONFIG_FUTEX_PI
extern void exit_pi_state_list(struct task_struct *curr);
#else
static inline void exit_pi_state_list(struct task_struct *curr)
{
}
#endif
#endif