are defined. These operations can be used without worrying about
preemption and interrupts.
- this_cpu_add()
this_cpu_read(pcp)
this_cpu_write(pcp, val)
this_cpu_add(pcp, val)
modifies the variable, then RMW actions can not be guaranteed to be
safe.
- __this_cpu_add()
__this_cpu_read(pcp)
__this_cpu_write(pcp, val)
__this_cpu_add(pcp, val)