Hi...
And the get_cpu() ? Its not supposed to disable preemption in all cpus?
from include/linux/smp.h:
#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
Same thing, only for current CPU with executes the code path that calls
preempt_enable/disable(). You can check the definition of
preempt_count() in {kerneldir}/include/linux/smp.h:
#define preempt_count() (current_thread_info()->preempt_count)
There, you'll see that the preemption flag is actually tied to current
task_struct's stack. Since a task run on a processor at a time, I follow
the same logic that preemption is also enabled/disabled for current
processor only.
regards,
Mulyadi.
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