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authorThomas Gleixner <tglx@linutronix.de>2016-11-30 21:04:44 +0000
committerIngo Molnar <mingo@kernel.org>2016-12-02 11:13:57 +0100
commitb5016e8203003c44264ec88fe2276ff54a51f689 (patch)
tree8ab8ce601c94fe139fc4830efa04e055b60d5d91 /kernel/locking
parent1b95b1a06cb27badb3e53329fb56af2a2113fd80 (diff)
downloadop-kernel-dev-b5016e8203003c44264ec88fe2276ff54a51f689.zip
op-kernel-dev-b5016e8203003c44264ec88fe2276ff54a51f689.tar.gz
locking/rtmutex: Get rid of RT_MUTEX_OWNER_MASKALL
This is a left over from the original rtmutex implementation which used both bit0 and bit1 in the owner pointer. Commit: 8161239a8bcc ("rtmutex: Simplify PI algorithm and make highest prio task get lock") ... removed the usage of bit1, but kept the extra mask around. This is confusing at best. Remove it and just use RT_MUTEX_HAS_WAITERS for the masking. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Daney <ddaney@caviumnetworks.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/20161130210030.509567906@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/rtmutex_common.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index e317e1c..9901346 100644
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -71,13 +71,12 @@ task_top_pi_waiter(struct task_struct *p)
* lock->owner state tracking:
*/
#define RT_MUTEX_HAS_WAITERS 1UL
-#define RT_MUTEX_OWNER_MASKALL 1UL
static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
{
unsigned long owner = (unsigned long) READ_ONCE(lock->owner);
- return (struct task_struct *) (owner & ~RT_MUTEX_OWNER_MASKALL);
+ return (struct task_struct *) (owner & ~RT_MUTEX_HAS_WAITERS);
}
/*
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