diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-09-27 11:11:46 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@rostedt.homelinux.com> | 2012-10-26 14:31:55 -0400 |
| commit | a4949329144e585370c72fe0fe7d416c37e4e09c (patch) | |
| tree | 1d8d24074baef4c800b8730cc0906a9ce75545af | |
| parent | 4367cc26d60d14f2bda527bcf9a08a5f98d3180d (diff) | |
mm: page_alloc: Use local_lock_on() instead of plain spinlock
The plain spinlock while sufficient does not update the local_lock
internals. Use a proper local_lock function instead to ease debugging.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | include/linux/locallock.h | 11 | ||||
| -rw-r--r-- | mm/page_alloc.c | 4 |
2 files changed, 13 insertions, 2 deletions
diff --git a/include/linux/locallock.h b/include/linux/locallock.h index 0161fbbffc25..f1804a38dd44 100644 --- a/include/linux/locallock.h +++ b/include/linux/locallock.h @@ -137,6 +137,12 @@ static inline int __local_lock_irqsave(struct local_irq_lock *lv) _flags = __get_cpu_var(lvar).flags; \ } while (0) +#define local_lock_irqsave_on(lvar, _flags, cpu) \ + do { \ + __local_lock_irqsave(&per_cpu(lvar, cpu)); \ + _flags = per_cpu(lvar, cpu).flags; \ + } while (0) + static inline int __local_unlock_irqrestore(struct local_irq_lock *lv, unsigned long flags) { @@ -156,6 +162,11 @@ static inline int __local_unlock_irqrestore(struct local_irq_lock *lv, put_local_var(lvar); \ } while (0) +#define local_unlock_irqrestore_on(lvar, flags, cpu) \ + do { \ + __local_unlock_irqrestore(&per_cpu(lvar, cpu), flags); \ + } while (0) + #define local_spin_trylock_irq(lvar, lock) \ ({ \ int __locked; \ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 47d939e2dac7..c645e07cbfee 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -227,9 +227,9 @@ static DEFINE_LOCAL_IRQ_LOCK(pa_lock); #ifdef CONFIG_PREEMPT_RT_BASE # define cpu_lock_irqsave(cpu, flags) \ - spin_lock_irqsave(&per_cpu(pa_lock, cpu).lock, flags) + local_lock_irqsave_on(pa_lock, flags, cpu) # define cpu_unlock_irqrestore(cpu, flags) \ - spin_unlock_irqrestore(&per_cpu(pa_lock, cpu).lock, flags) + local_unlock_irqrestore_on(pa_lock, flags, cpu) #else # define cpu_lock_irqsave(cpu, flags) local_irq_save(flags) # define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags) |