generic-ipi: cleanup for generic_smp_call_function_interrupt()

Use smp_processor_id() instead of get_cpu() and put_cpu() in
generic_smp_call_function_interrupt(), It's no need to disable preempt,
because we must call generic_smp_call_function_interrupt() with interrupts
disabled.

Signed-off-by: Xiao Guangrong <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/kernel/smp.c b/kernel/smp.c
index a8c76069cf5042008d5b85b957a132acbeacdad6..00a1d0ede532cad0b3acd9f0dad73c5ec26655d7 100644 (file)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -171,7 +171,7 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait)
 void generic_smp_call_function_interrupt(void)
 {
        struct call_function_data *data;
-       int cpu = get_cpu();
+       int cpu = smp_processor_id();
 
        /*
         * Shouldn't receive this interrupt on a cpu that is not yet online.
@@ -212,7 +212,6 @@ void generic_smp_call_function_interrupt(void)
                csd_unlock(&data->csd);
        }
 
-       put_cpu();
 }
 
 /*