Messages in this thread Patch in this message | | | Date | Tue, 30 Nov 2010 13:07:24 -0600 | From | Christoph Lameter <> | Subject | [thisops uV3 17/18] Connector: Use this_cpu operations |
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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> Signed-off-by: Christoph Lameter <cl@linux.com>
--- 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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