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connector: Use this_cpu operations

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The patch was originally in the use cpuops patchset but it needs an
inc_return and is therefore dependent on an extension of the cpu ops.
Fixed up and verified that it compiles.

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@ubuntu.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Christoph Lameter 2010-12-08 17:42:23 +01:00 committed by Tejun Heo
parent b2e4ae6975
commit 3ea9f6833c
1 changed files with 3 additions and 2 deletions
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5
drivers/connector/cn_proc.c
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@ -43,9 +43,10 @@ static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
static inline void get_seq(__u32 *ts, int *cpu)
{
*ts = get_cpu_var(proc_event_counts)++;
preempt_disable();
*ts = __this_cpu_inc_return(proc_event_counts) -1;
*cpu = smp_processor_id();
put_cpu_var(proc_event_counts);
preempt_enable();
}
void proc_fork_connector(struct task_struct *task)