linux-kernel - [PATCH 53/89] sched/headers: Simplify <linux/sched/task.h> dependencies

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Date:   Mon,  6 Feb 2017 14:28:56 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Galbraith <efault@....de>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 53/89] sched/headers: Simplify <linux/sched/task.h> dependencies

Move rcu_copy_process() into kernel/fork.c, which is the only
user of this inline function.

This simplifies <linux/sched/task.h> to the level that <linux/sched.h>
does not have to be included in it anymore.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Mike Galbraith <efault@....de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/mips/include/asm/processor.h |  1 -
 include/linux/sched/task.h        | 21 ++++-----------------
 kernel/fork.c                     | 15 +++++++++++++++
 3 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/arch/mips/include/asm/processor.h b/arch/mips/include/asm/processor.h
index 461734dea839..95b8c471f572 100644
--- a/arch/mips/include/asm/processor.h
+++ b/arch/mips/include/asm/processor.h
@@ -14,7 +14,6 @@
 #include <linux/atomic.h>
 #include <linux/cpumask.h>
 #include <linux/threads.h>
-#include <linux/sched/task.h>
 
 #include <asm/cachectl.h>
 #include <asm/cpu.h>
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index e93638a03515..5cdb7ee3978b 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -1,13 +1,15 @@
 #ifndef _LINUX_SCHED_TASK_H
 #define _LINUX_SCHED_TASK_H
 
+#include <linux/spinlock.h>
+
+struct task_struct;
+
 /*
  * Interface between the scheduler and various task lifetime (fork()/exit())
  * functionality:
  */
 
-#include <linux/sched.h>
-
 /*
  * This serializes "schedule()" and also protects
  * the run-queue from deletions/modifications (but
@@ -25,21 +27,6 @@ extern asmlinkage void schedule_tail(struct task_struct *prev);
 extern void init_idle(struct task_struct *idle, int cpu);
 extern void init_idle_bootup_task(struct task_struct *idle);
 
-static inline void rcu_copy_process(struct task_struct *p)
-{
-#ifdef CONFIG_PREEMPT_RCU
-	p->rcu_read_lock_nesting = 0;
-	p->rcu_read_unlock_special.s = 0;
-	p->rcu_blocked_node = NULL;
-	INIT_LIST_HEAD(&p->rcu_node_entry);
-#endif /* #ifdef CONFIG_PREEMPT_RCU */
-#ifdef CONFIG_TASKS_RCU
-	p->rcu_tasks_holdout = false;
-	INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
-	p->rcu_tasks_idle_cpu = -1;
-#endif /* #ifdef CONFIG_TASKS_RCU */
-}
-
 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
 extern void sched_dead(struct task_struct *p);
 
diff --git a/kernel/fork.c b/kernel/fork.c
index 63f2e6e693fa..d5802d7e9bdb 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1462,6 +1462,21 @@ init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
 	 task->pids[type].pid = pid;
 }
 
+static inline void rcu_copy_process(struct task_struct *p)
+{
+#ifdef CONFIG_PREEMPT_RCU
+	p->rcu_read_lock_nesting = 0;
+	p->rcu_read_unlock_special.s = 0;
+	p->rcu_blocked_node = NULL;
+	INIT_LIST_HEAD(&p->rcu_node_entry);
+#endif /* #ifdef CONFIG_PREEMPT_RCU */
+#ifdef CONFIG_TASKS_RCU
+	p->rcu_tasks_holdout = false;
+	INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
+	p->rcu_tasks_idle_cpu = -1;
+#endif /* #ifdef CONFIG_TASKS_RCU */
+}
+
 /*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.
-- 
2.7.4