SMP: Enforce this rule: Tasks which are normally restored when sched_unlock() is called must remain pending (1) if we are in a critical section, i.e., g_cpu_irqlock is locked , or (2) other CPUs still have pre-emption disabled, i.e., g_cpu_schedlock is locked.  In those cases, the release of the pending tasks must be deferred until those conditions are met.

Revert "SMP:  Fix a error introduced in 36b676ee and fully decouple disabling of pre-emption from critical sections."

This reverts commit 9aedf1bd.

Xtensa ESP32: Remove call to sched_lock()/unock() from inter-cpu interrupt logic.  Results in recursive call to sched_mergepending().

Revert "Xtensa SMP: Avoid a nasty situation in SMP by assuring that up_release_pending() is not re-entered."

This reverts commit 733a57b4.

This reverts commit fb146abe.

SMP:  Fix a error introduced in 36b676ee and fully decouple disabling of pre-emption from critical sections.

Allow dma in 1 bit mode in STM32F4xxx

STM32: Forgot to update chip.h for STM32F303x[BC]'s 4 ADCs

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.

SMP: Fix logic error in last change:  Deferred restoration of IRQ lock only applies if the context switch was on this CPU.

sched note: record ID enumeration now results on constant values; ID values do not change with configuration.  This makes writing post-processing software much easier

SMP sched_unlock: Should merging depend on g_cpu_irqlock or not?  Let's at least be consistent.  And don't use irqcount; use g_cpu_irqlock.

Xtensa ESP32:  Corrects a problem with dispatching to signal handlers:  Cannot vector directly to the signal handling function as in other ABIs under the Xtensa Window ABI.  In that case, we need to go through a tiny hook when performs the correct window call (call4) otherwise registers will be scrambled in the signal handler

Xtensa ESP32: Some fixes from integration of ostest configuration.  Almost works: There are some assertions in xtensa_sigdeliver()