dff846643cb
parent 2a61812af2e564cba2c8170cf96e1c823210f619
author H. Peter Anvin <hpa@zytor.com> 1219709234 -0700
committer H. Peter Anvin <hpa@zytor.com> 1219711548 -0700

smp: have smp_call_function_single() detect invalid CPUs

Have smp_call_function_single() return invalid CPU indicies and return
-ENXIO.  This function is already executed inside a
get_cpu()..put_cpu() which locks out CPU removal, so rather than
having the higher layers doing another layer of locking to guard
against unplugged CPUs do the test here.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>