Commit-ID: a77353e5eb56b6c6098bfce59aff1f449451b0b7
Gitweb: http://git.kernel.org/tip/a77353e5eb56b6c6098bfce59aff1f449451b0b7
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 25 Jun 2014 07:13:07 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Sat, 5 Jul 2014 11:17:26 +0200
irq_work: Remove BUG_ON in irq_work_run()
Because of a collision with 8d056c48e486 ("CPU hotplug, smp: flush any
pending IPI callbacks before CPU offline"), which ends up calling
hotplug_cfd()->flush_smp_call_function_queue()->irq_work_run(), which
is not from IRQ context.
And since that already calls irq_work_run() from the hotplug path,
remove our entire hotplug handling.
Reported-by: Stephen Warren <swarren@xxxxxxxxxxxxx>
Tested-by: Stephen Warren <swarren@xxxxxxxxxxxxx>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-busatzs2gvz4v62258agipuf@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/irq_work.c | 46 ++++------------------------------------------
1 file changed, 4 insertions(+), 42 deletions(-)
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 4b0a890..e6bcbe7 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -160,20 +160,14 @@ static void irq_work_run_list(struct llist_head *list)
}
}
-static void __irq_work_run(void)
-{
- irq_work_run_list(&__get_cpu_var(raised_list));
- irq_work_run_list(&__get_cpu_var(lazy_list));
-}
-
/*
- * Run the irq_work entries on this cpu. Requires to be ran from hardirq
- * context with local IRQs disabled.
+ * hotplug calls this through:
+ * hotplug_cfd() -> flush_smp_call_function_queue()
*/
void irq_work_run(void)
{
- BUG_ON(!in_irq());
- __irq_work_run();
+ irq_work_run_list(&__get_cpu_var(raised_list));
+ irq_work_run_list(&__get_cpu_var(lazy_list));
}
EXPORT_SYMBOL_GPL(irq_work_run);
@@ -189,35 +183,3 @@ void irq_work_sync(struct irq_work *work)
cpu_relax();
}
EXPORT_SYMBOL_GPL(irq_work_sync);
-
-#ifdef CONFIG_HOTPLUG_CPU
-static int irq_work_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
-{
- long cpu = (long)hcpu;
-
- switch (action) {
- case CPU_DYING:
- /* Called from stop_machine */
- if (WARN_ON_ONCE(cpu != smp_processor_id()))
- break;
- __irq_work_run();
- break;
- default:
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block cpu_notify;
-
-static __init int irq_work_init_cpu_notifier(void)
-{
- cpu_notify.notifier_call = irq_work_cpu_notify;
- cpu_notify.priority = 0;
- register_cpu_notifier(&cpu_notify);
- return 0;
-}
-device_initcall(irq_work_init_cpu_notifier);
-
-#endif /* CONFIG_HOTPLUG_CPU */
--
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