arch: inline this_task to improve performence

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

Signed-off-by: hujun5 <hujun5@xiaomi.com>

sched/sched/CMakeLists.txt

@@ -108,10 +108,6 @@ else()
   list(APPEND SRCS sched_processtimer.c)
 endif()
 
-if(CONFIG_SMP)
-  list(APPEND SRCS sched_thistask.c)
-endif()
-
 if(CONFIG_SCHED_CRITMONITOR)
   list(APPEND SRCS sched_critmonitor.c)
 endif()

sched/sched/Make.defs

@@ -84,10 +84,6 @@ else
 CSRCS += sched_processtimer.c
 endif
 
-ifeq ($(CONFIG_SMP),y)
-CSRCS += sched_thistask.c
-endif
-
 ifeq ($(CONFIG_SCHED_CRITMONITOR),y)
 CSRCS += sched_critmonitor.c
 endif

sched/sched/sched.h

@@ -353,7 +353,28 @@ void nxsched_suspend(FAR struct tcb_s *tcb);
 #endif
 
 #ifdef CONFIG_SMP
-FAR struct tcb_s *this_task(void) noinstrument_function;
+noinstrument_function
+static inline_function FAR struct tcb_s *this_task(void)
+{
+  FAR struct tcb_s *tcb;
+  irqstate_t flags;
+
+  /* If the CPU supports suppression of interprocessor interrupts, then
+   * simple disabling interrupts will provide sufficient protection for
+   * the following operations.
+   */
+
+  flags = up_irq_save();
+
+  /* Obtain the TCB which is currently running on this CPU */
+
+  tcb = current_task(this_cpu());
+
+  /* Enable local interrupts */
+
+  up_irq_restore(flags);
+  return tcb;
+}
 
 int  nxsched_select_cpu(cpu_set_t affinity);
 int  nxsched_pause_cpu(FAR struct tcb_s *tcb);

sched/sched/sched_thistask.c

@@ -1,76 +0,0 @@
-/****************************************************************************
- * sched/sched/sched_thistask.c
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.  The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-
-#include <sys/types.h>
-#include <arch/irq.h>
-
-#include <nuttx/irq.h>
-#include <nuttx/spinlock.h>
-
-#include "sched/sched.h"
-
-#ifdef CONFIG_SMP
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: this_task
- *
- * Description:
- *   The functions will safely obtain the TCB that is currently running
- *   on the current CPU. In SMP, this must be done by disabling local
- *   interrupts to avoid CPU switching during access to current_task()
- *
- * Returned Value:
- *   the TCB that is currently running on the current CPU.
- *
- ****************************************************************************/
-
-FAR struct tcb_s *this_task(void)
-{
-  FAR struct tcb_s *tcb;
-  irqstate_t flags;
-
-  /* If the CPU supports suppression of interprocessor interrupts, then
-   * simple disabling interrupts will provide sufficient protection for
-   * the following operations.
-   */
-
-  flags = up_irq_save();
-
-  /* Obtain the TCB which is currently running on this CPU */
-
-  tcb = current_task(this_cpu());
-
-  /* Enable local interrupts */
-
-  up_irq_restore(flags);
-  return tcb;
-}
-
-#endif /* CONFIG_SMP */