x86/cpu/intel_epb: Don't rely on link order

intel_epb_init() is called as a subsys_initcall() to register cpuhp
callbacks. The callbacks make use of get_cpu_device() which will return
NULL unless register_cpu() has been called. register_cpu() is called
from topology_init(), which is also a subsys_initcall().

This is fragile. Moving the register_cpu() to a different
subsys_initcall() leads to a NULL dereference during boot.

Make intel_epb_init() a late_initcall(), user-space can't provide a
policy before this point anyway.

Signed-off-by: James Morse <[email protected]>
Signed-off-by: Russell King (Oracle) <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Gavin Shan <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>

Author: James Morse

arch/x86/kernel/cpu/intel_epb.c

@@ -237,4 +237,4 @@ static __init int intel_epb_init(void)
 	cpuhp_remove_state(CPUHP_AP_X86_INTEL_EPB_ONLINE);
 	return ret;
 }
-subsys_initcall(intel_epb_init);
+late_initcall(intel_epb_init);