get_seq can benefit from this_cpu_operations. Address calculation is avoided
and the increment is done using an xadd.
Cc: Scott James Remnant <scott@xxxxxxxxxx>
Cc: Mike Frysinger <vapier@xxxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
drivers/connector/cn_proc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
Index: linux-2.6/drivers/connector/cn_proc.c
===================================================================
--- linux-2.6.orig/drivers/connector/cn_proc.c 2010-11-30 09:38:33.000000000 -0600
+++ linux-2.6/drivers/connector/cn_proc.c 2010-11-30 09:39:38.000000000 -0600
@@ -43,9 +43,10 @@ static DEFINE_PER_CPU(__u32, proc_event_
static inline void get_seq(__u32 *ts, int *cpu)
{
- *ts = get_cpu_var(proc_event_counts)++;
+ preempt_disable();
+ *ts = __this_cpu_inc(proc_event_counts);
*cpu = smp_processor_id();
- put_cpu_var(proc_event_counts);
+ preempt_enable();
}
void proc_fork_connector(struct task_struct *task)
--
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