SMP: Back out deferred IRQ locking. This was accidentally merged into master and it looks like it is going to be more work than I thought to get it working again. Changes will go to the irqlock branch.

arch/xtensa/src/common/xtensa_context.S

@@ -529,28 +529,6 @@ _xtensa_context_restore:
 xtensa_context_restore:
 	ENTRY(16)
 
-#ifdef CONFIG_SMP
-	/* Since this function does not return, it is only necessary preserve the
-	 * processor state state are pointer across the following C call.
-	 */
-
-	s32i	a2, sp, LOCAL_OFFSET(1)
-
-	/* In the SMP configuration, critical section management uses a
-	 * "voting" algorithm with current task on each CPU casting its
-	 * "vote" by the state of the TCB irqcount flag.  That irqcount
-	 * for the current task on this CPU will be different is a
-	 * context switch occurrred.
-	 *
-	 * REVISIT:  This should be the very last thing that is done before the
-	 * 'rfe'.  Ideally, you will like to have all of the registers restored
-	 * (or protected on the stack) when the IRQ lock is unlocked.
-	 */
-
-	call4	irq_restore_lock
-	l32i	a2, sp, LOCAL_OFFSET(1)
-#endif
-
 #ifndef __XTENSA_CALL0_ABI__
 	/* Force a spill of the live registers of the thread that has been
 	 * suspended.

arch/xtensa/src/common/xtensa_irqdispatch.c

@@ -52,7 +52,6 @@
 
 #include "group/group.h"
 #include "sched/sched.h"
-#include "irq/irq.h"
 
 /****************************************************************************
  * Public Functions
@@ -130,17 +129,6 @@ uint32_t *xtensa_irq_dispatch(int irq, uint32_t *regs)
 
       (void)group_addrenv(NULL);
 #endif
-
-#ifdef CONFIG_SMP
-      /* In the SMP configuration, critical section management uses a
-       * "voting" algorithm with current task on each CPU casting its
-       * "vote" by the state of the TCB irqcount flag.  That irqcount
-       * for the current task on this CPU will be different is a
-       * context switch occurrred.
-       */
-
-      irq_restore_lock();
-#endif
     }
 #endif