irq: add [enter|leave]_critical_section_nonirq

Configuring NuttX and compile:
$ ./tools/configure.sh -l qemu-armv8a:nsh_smp
$ make
Running with qemu
$ qemu-system-aarch64 -cpu cortex-a53 -smp 4 -nographic \
   -machine virt,virtualization=on,gic-version=3 \
   -net none -chardev stdio,id=con,mux=on -serial chardev:con \
   -mon chardev=con,mode=readline -kernel ./nuttx

reason:
In some non-irq scenarios, we can simplify
the implementation of critical sections to improve performance.

Signed-off-by: hujun5 <[email protected]>

Author: hujun260

include/nuttx/irq.h

@@ -258,8 +258,10 @@ int irqchain_detach(int irq, xcpt_t isr, FAR void *arg);
  ****************************************************************************/
 
 #ifdef CONFIG_IRQCOUNT
+irqstate_t enter_critical_section_nonirq(void) noinstrument_function;
 irqstate_t enter_critical_section(void) noinstrument_function;
 #else
+#  define enter_critical_section_nonirq() up_irq_save()
 #  define enter_critical_section() up_irq_save()
 #endif
 
@@ -288,8 +290,10 @@ irqstate_t enter_critical_section(void) noinstrument_function;
  ****************************************************************************/
 
 #ifdef CONFIG_IRQCOUNT
+void leave_critical_section_nonirq(irqstate_t flags) noinstrument_function;
 void leave_critical_section(irqstate_t flags) noinstrument_function;
 #else
+#  define leave_critical_section_nonirq(f) up_irq_restore(f)
 #  define leave_critical_section(f) up_irq_restore(f)
 #endif