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Subject[PATCH] stop_machine: disable preempt in stop machine path
We can disable preempt in stop_cpu(), It can reduce the cpu's waiting time
and make stop_machine path faster.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
kernel/stop_machine.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 912823e..feaa947 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -68,7 +68,7 @@ static void stop_cpu(struct work_struct *unused)
{
enum stopmachine_state curstate = STOPMACHINE_NONE;
struct stop_machine_data *smdata = &idle;
- int cpu = smp_processor_id();
+ int cpu = get_cpu();
int err;

if (!active_cpus) {
@@ -103,6 +103,7 @@ static void stop_cpu(struct work_struct *unused)
}
} while (curstate != STOPMACHINE_EXIT);

+ put_cpu();
local_irq_enable();
}

--
1.6.1.2


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