[tip: irq/core] tasklet: Remove tasklet_kill_immediate

[tip-bot2 for Davidlohr Bueso]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     3a0ade0c521a542f8a25e96ce8ea0dfaa532ac75
Gitweb:        https://git.kernel.org/tip/3a0ade0c521a542f8a25e96ce8ea0dfaa532ac75
Author:        Davidlohr Bueso <dave@xxxxxxxxxxxx>
AuthorDate:    Sat, 06 Mar 2021 13:36:58 -08:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 16 Mar 2021 15:06:31 +01:00

tasklet: Remove tasklet_kill_immediate

Ever since RCU was converted to softirq, it has no users.

Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210306213658.12862-1-dave@xxxxxxxxxxxx

---
 include/linux/interrupt.h |  1 -
 kernel/softirq.c          | 32 --------------------------------
 2 files changed, 33 deletions(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 76f1161..2b98156 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -716,7 +716,6 @@ static inline void tasklet_enable(struct tasklet_struct *t)
 }
 
 extern void tasklet_kill(struct tasklet_struct *t);
-extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
 extern void tasklet_init(struct tasklet_struct *t,
 			 void (*func)(unsigned long), unsigned long data);
 extern void tasklet_setup(struct tasklet_struct *t,
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 9908ec4..8b44ab9 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -658,38 +658,6 @@ static void run_ksoftirqd(unsigned int cpu)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-/*
- * tasklet_kill_immediate is called to remove a tasklet which can already be
- * scheduled for execution on @cpu.
- *
- * Unlike tasklet_kill, this function removes the tasklet
- * _immediately_, even if the tasklet is in TASKLET_STATE_SCHED state.
- *
- * When this function is called, @cpu must be in the CPU_DEAD state.
- */
-void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu)
-{
-	struct tasklet_struct **i;
-
-	BUG_ON(cpu_online(cpu));
-	BUG_ON(test_bit(TASKLET_STATE_RUN, &t->state));
-
-	if (!test_bit(TASKLET_STATE_SCHED, &t->state))
-		return;
-
-	/* CPU is dead, so no lock needed. */
-	for (i = &per_cpu(tasklet_vec, cpu).head; *i; i = &(*i)->next) {
-		if (*i == t) {
-			*i = t->next;
-			/* If this was the tail element, move the tail ptr */
-			if (*i == NULL)
-				per_cpu(tasklet_vec, cpu).tail = i;
-			return;
-		}
-	}
-	BUG();
-}
-
 static int takeover_tasklets(unsigned int cpu)
 {
 	/* CPU is dead, so no lock needed. */