diff mbox series

[11/19] softirq: Move related code into one section

Message ID 20201113141733.974214480@linutronix.de
State New
Headers show
Series softirq: Cleanups and RT awareness | expand

Commit Message

Thomas Gleixner Nov. 13, 2020, 2:02 p.m. UTC
To prepare for adding a RT aware variant of softirq serialization and
processing move related code into one section so the necessary #ifdeffery
is reduced to one.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/softirq.c |  107 +++++++++++++++++++++++++++----------------------------
 1 file changed, 54 insertions(+), 53 deletions(-)

Comments

Frederic Weisbecker Nov. 19, 2020, 12:20 p.m. UTC | #1
On Fri, Nov 13, 2020 at 03:02:18PM +0100, Thomas Gleixner wrote:
> To prepare for adding a RT aware variant of softirq serialization and
> processing move related code into one section so the necessary #ifdeffery
> is reduced to one.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Up to this patch at least:

Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
diff mbox series

Patch

--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -92,6 +92,13 @@  static bool ksoftirqd_running(unsigned l
 		!__kthread_should_park(tsk);
 }
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+DEFINE_PER_CPU(int, hardirqs_enabled);
+DEFINE_PER_CPU(int, hardirq_context);
+EXPORT_PER_CPU_SYMBOL_GPL(hardirqs_enabled);
+EXPORT_PER_CPU_SYMBOL_GPL(hardirq_context);
+#endif
+
 /*
  * preempt_count and SOFTIRQ_OFFSET usage:
  * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving
@@ -102,17 +109,11 @@  static bool ksoftirqd_running(unsigned l
  * softirq and whether we just have bh disabled.
  */
 
+#ifdef CONFIG_TRACE_IRQFLAGS
 /*
- * This one is for softirq.c-internal use,
- * where hardirqs are disabled legitimately:
+ * This is for softirq.c-internal use, where hardirqs are disabled
+ * legitimately:
  */
-#ifdef CONFIG_TRACE_IRQFLAGS
-
-DEFINE_PER_CPU(int, hardirqs_enabled);
-DEFINE_PER_CPU(int, hardirq_context);
-EXPORT_PER_CPU_SYMBOL_GPL(hardirqs_enabled);
-EXPORT_PER_CPU_SYMBOL_GPL(hardirq_context);
-
 void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
 {
 	unsigned long flags;
@@ -203,6 +204,50 @@  void __local_bh_enable_ip(unsigned long
 }
 EXPORT_SYMBOL(__local_bh_enable_ip);
 
+static inline void invoke_softirq(void)
+{
+	if (ksoftirqd_running(local_softirq_pending()))
+		return;
+
+	if (!force_irqthreads) {
+#ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
+		/*
+		 * We can safely execute softirq on the current stack if
+		 * it is the irq stack, because it should be near empty
+		 * at this stage.
+		 */
+		__do_softirq();
+#else
+		/*
+		 * Otherwise, irq_exit() is called on the task stack that can
+		 * be potentially deep already. So call softirq in its own stack
+		 * to prevent from any overrun.
+		 */
+		do_softirq_own_stack();
+#endif
+	} else {
+		wakeup_softirqd();
+	}
+}
+
+asmlinkage __visible void do_softirq(void)
+{
+	__u32 pending;
+	unsigned long flags;
+
+	if (in_interrupt())
+		return;
+
+	local_irq_save(flags);
+
+	pending = local_softirq_pending();
+
+	if (pending && !ksoftirqd_running(pending))
+		do_softirq_own_stack();
+
+	local_irq_restore(flags);
+}
+
 /*
  * We restart softirq processing for at most MAX_SOFTIRQ_RESTART times,
  * but break the loop if need_resched() is set or after 2 ms.
@@ -327,24 +372,6 @@  asmlinkage __visible void __softirq_entr
 	current_restore_flags(old_flags, PF_MEMALLOC);
 }
 
-asmlinkage __visible void do_softirq(void)
-{
-	__u32 pending;
-	unsigned long flags;
-
-	if (in_interrupt())
-		return;
-
-	local_irq_save(flags);
-
-	pending = local_softirq_pending();
-
-	if (pending && !ksoftirqd_running(pending))
-		do_softirq_own_stack();
-
-	local_irq_restore(flags);
-}
-
 /**
  * irq_enter_rcu - Enter an interrupt context with RCU watching
  */
@@ -371,32 +398,6 @@  void irq_enter(void)
 	irq_enter_rcu();
 }
 
-static inline void invoke_softirq(void)
-{
-	if (ksoftirqd_running(local_softirq_pending()))
-		return;
-
-	if (!force_irqthreads) {
-#ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
-		/*
-		 * We can safely execute softirq on the current stack if
-		 * it is the irq stack, because it should be near empty
-		 * at this stage.
-		 */
-		__do_softirq();
-#else
-		/*
-		 * Otherwise, irq_exit() is called on the task stack that can
-		 * be potentially deep already. So call softirq in its own stack
-		 * to prevent from any overrun.
-		 */
-		do_softirq_own_stack();
-#endif
-	} else {
-		wakeup_softirqd();
-	}
-}
-
 static inline void tick_irq_exit(void)
 {
 #ifdef CONFIG_NO_HZ_COMMON