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...this optimization. Also note that I don't have this cmpxchg loop anymore. > kernel/locking/qspinlock.c | 32 ++++++++++++++++++++++++++++++-- > 1 files changed, 30 insertions(+), 2 deletions(-) > > diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c > index 55601b4..497da24 100644 > --- a/kernel/locking/qspinlock.c > +++ b/kernel/locking/qspinlock.c > @@ -216,6 +216,7 @@ xchg_tail(struct qspinlock *lock, u32 tail, u32 *pval) > static inline int trylock_pending(struct qspinlock *lock, u32 *pval) > { > u32 old, new, val = *pval; > + int...

...this optimization. Also note that I don't have this cmpxchg loop anymore. > kernel/locking/qspinlock.c | 32 ++++++++++++++++++++++++++++++-- > 1 files changed, 30 insertions(+), 2 deletions(-) > > diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c > index 55601b4..497da24 100644 > --- a/kernel/locking/qspinlock.c > +++ b/kernel/locking/qspinlock.c > @@ -216,6 +216,7 @@ xchg_tail(struct qspinlock *lock, u32 tail, u32 *pval) > static inline int trylock_pending(struct qspinlock *lock, u32 *pval) > { > u32 old, new, val = *pval; > + int...

...cket spinlock is still quite a bit faster. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- kernel/locking/qspinlock.c | 32 ++++++++++++++++++++++++++++++-- 1 files changed, 30 insertions(+), 2 deletions(-) diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 55601b4..497da24 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -216,6 +216,7 @@ xchg_tail(struct qspinlock *lock, u32 tail, u32 *pval) static inline int trylock_pending(struct qspinlock *lock, u32 *pval) { u32 old, new, val = *pval; + int retry = 1; /* * trylock ||...

...xpense of a bit of slowdown in the pending bit code path. >> kernel/locking/qspinlock.c | 32 ++++++++++++++++++++++++++++++-- >> 1 files changed, 30 insertions(+), 2 deletions(-) >> >> diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c >> index 55601b4..497da24 100644 >> --- a/kernel/locking/qspinlock.c >> +++ b/kernel/locking/qspinlock.c >> @@ -216,6 +216,7 @@ xchg_tail(struct qspinlock *lock, u32 tail, u32 *pval) >> static inline int trylock_pending(struct qspinlock *lock, u32 *pval) >> { >> u32 old, n...

...ET) #define _Q_TAIL_CPU_MASK _Q_SET_MASK(TAIL_CPU) +#define _Q_TAIL_OFFSET _Q_TAIL_IDX_OFFSET #define _Q_TAIL_MASK (_Q_TAIL_IDX_MASK | _Q_TAIL_CPU_MASK) #define _Q_LOCKED_VAL (1U << _Q_LOCKED_OFFSET) diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index fcf06cb..55601b4 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -22,8 +22,13 @@ #include <linux/percpu.h> #include <linux/hardirq.h> #include <linux/mutex.h> +#include <asm/byteorder.h> #include <asm/qspinlock.h> +#if !defined(__LITTLE_ENDIAN) &&a...

v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex patches into smaller ones to ease review effort. - Fix a racing condition in the PV qspinlock code. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving

v8->v9: - Integrate PeterZ's version of the queue spinlock patch with some modification: http://lkml.kernel.org/r/20140310154236.038181843 at infradead.org - Break the more complex patches into smaller ones to ease review effort. - Fix a racing condition in the PV qspinlock code. v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving