The patch titled
lock debugging: loop nicer in mark_rt_mutex_waiters
has been added to the -mm tree. Its filename is
lock-debugging-loop-nicer-in-mark_rt_mutex_waiters.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: lock debugging: loop nicer in mark_rt_mutex_waiters
From: Ingo Molnar <mingo@xxxxxxx>
Loop nicer in the mark_rt_mutex_waiters() busy loop.
Fix white space damage while at it.
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/rtmutex_common.h | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff -puN kernel/rtmutex_common.h~lock-debugging-loop-nicer-in-mark_rt_mutex_waiters kernel/rtmutex_common.h
--- a/kernel/rtmutex_common.h~lock-debugging-loop-nicer-in-mark_rt_mutex_waiters
+++ a/kernel/rtmutex_common.h
@@ -103,7 +103,7 @@ static inline struct task_struct *rt_mut
static inline struct task_struct *rt_mutex_real_owner(struct rt_mutex *lock)
{
- return (struct task_struct *)
+ return (struct task_struct *)
((unsigned long)lock->owner & ~RT_MUTEX_HAS_WAITERS);
}
@@ -120,11 +120,13 @@ static inline unsigned long rt_mutex_own
# define rt_mutex_cmpxchg(l,c,n) (cmpxchg(&l->owner, c, n) == c)
static inline void mark_rt_mutex_waiters(struct rt_mutex *lock)
{
- unsigned long owner, *p = (unsigned long *) &lock->owner;
+ unsigned long *p = (unsigned long *) &lock->owner;
+ unsigned long owner = *p;
- do {
+ while (cmpxchg(p, owner, owner | RT_MUTEX_HAS_WAITERS) != owner) {
+ cpu_relax();
owner = *p;
- } while (cmpxchg(p, owner, owner | RT_MUTEX_HAS_WAITERS) != owner);
+ }
}
#else
# define rt_mutex_cmpxchg(l,c,n) (0)
_
Patches currently in -mm which might be from mingo@xxxxxxx are
rt-mutex-fix-stale-return-value.patch
rt-mutex-fix-chain-walk-early-wakeup-bug.patch
pi-futex-fix-exit-races-and-locking-problems.patch
git-acpi-add-exports.patch
git-kvm.patch
git-selinux.patch
x86_64-irq-check-remote-irr-bit-before-migrating-level-triggered-irq-v3.patch
only-allow-nonlinear-vmas-for-ram-backed-filesystems.patch
cpuset-remove-sched-domain-hooks-from-cpusets.patch
introduce-write_trylock_irqsave.patch
use-write_trylock_irqsave-in-ptrace_attach.patch
fix-stop_machine_run-problem-with-naughty-real-time-process.patch
cpu-hotplug-fix-ksoftirqd-termination-on-cpu-hotplug-with-naughty-realtime-process.patch
cpu-hotplug-fix-ksoftirqd-termination-on-cpu-hotplug-with-naughty-realtime-process-fix.patch
pie-randomization.patch
vdso-print-fatal-signals.patch
remove-clockevents_releaserequest_device.patch
add-a-flag-to-indicate-deferrable-timers-in-proc-timer_stats.patch
introduce-o_cloexec-take-2.patch
introduce-o_cloexec-parisc-fix.patch
o_cloexec-for-scm_rights.patch
o_cloexec-for-scm_rights-fix.patch
o_cloexec-for-scm_rights-fix-2.patch
futex-tidy-up-the-code.patch
improve-behaviour-of-spurious-irq-detect.patch
improve-behaviour-of-spurious-irq-detect-fix.patch
lock-debugging-loop-nicer-in-mark_rt_mutex_waiters.patch
cfs-scheduler.patch
cfs-scheduler-vs-detach-schedh-from-mmh.patch
cfs-scheduler-v14-rc2-mm1.patch
cfs-scheduler-warning-fixes.patch
cfs-scheduler-v15-rc3-mm1.patch
fs-proc-basec-make-a-struct-static.patch
cfs-warning-fixes.patch
schedstats-fix-printk-format.patch
sched-add-above-background-load-function.patch
mm-implement-swap-prefetching.patch
fix-raw_spinlock_t-vs-lockdep.patch
lockdep-sanitise-config_prove_locking.patch
lockdep-reduce-the-ifdeffery.patch
lockstat-core-infrastructure.patch
lockstat-core-infrastructure-fix.patch
lockstat-core-infrastructure-fix-fix.patch
lockstat-core-infrastructure-fix-fix-fix.patch
lockstat-human-readability-tweaks.patch
lockstat-hook-into-spinlock_t-rwlock_t-rwsem-and-mutex.patch
detect-atomic-counter-underflows.patch
make-frame_pointer-default=y.patch
mutex-subsystem-synchro-test-module.patch
lockdep-show-held-locks-when-showing-a-stackdump.patch
kmap_atomic-debugging.patch
random-warning-squishes.patch
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