reboot: refactor and comment the cpu selection code

Small improvements to the code, without changing the way it works:

 - use a local variable, to avoid a small time lapse where reboot_cpu
   can have an invalid value

 - comment the code which is not easy to understand at a glance

 - merge two identical code blocks into one

 - replace pointer arithmetics with equivalent array syntax

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matteo Croce <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Fabian Frederick <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Robin Holt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions