On Mon, 5 Nov 2012, 锟斤拷锟斤拷 wrote: > I guarantee that x86-64 don't use gs register here. run test again锟斤拷 > Maybe there is some optimizations for __this_cpu_read call on x86-64锟斤拷 not > sure.
There is no optimization that I know of unless the compiler eliminated the __this_cpu_read completely. gs: is necessary to perform the implied relocation in this_cpu_read().
