tree 6c0ad7272dc9876ca96cab946404a2599f4a2e81
parent 780ba23eb85d8e83d5606db2a85846d86f9223a5
author Andy Ross <andrew.j.ross@intel.com> 1517246629 -0800
committer Anas Nashif <nashif@linux.intel.com> 1518795869 -0500

kernel: Make irq_{un}lock() APIs into a global spinlock in SMP mode

In SMP mode, the idea of a single "IRQ lock" goes away.  Long term,
all usage needs to migrate to spinlocks (which become simple IRQ locks
in the uniprocessor case).  For the near term, we can ease the
migration (at the expense of performance) by providing a compatibility
implementation around a single global lock.

Note that one complication is that the older lock was recursive, while
spinlocks will deadlock if you try to lock them twice.  So we
implement a simple "count" semantic to handle multiple locks.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>