[tip:timers/core] clockevents: Warn if cpu_all_mask is used as cpumask

[tip-bot for Sudeep Holla <tipbot@zytor.com>]

Commit-ID:  fbfa9260085b5b578a049a90135e5c51928c5f7f
Gitweb:     https://git.kernel.org/tip/fbfa9260085b5b578a049a90135e5c51928c5f7f
Author:     Sudeep Holla <sudeep.holla@arm.com>
AuthorDate: Wed, 11 Jul 2018 12:24:24 +0100
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 2 Aug 2018 14:55:53 +0200

clockevents: Warn if cpu_all_mask is used as cpumask

Using cpu_all_mask in clockevents cpumask may result in issues while
comparing multiple clockevent devices to choose the preferred one.

On one of the platforms with 2 system (i.e. non per-CPU) timers with
different ratings, having cpu_all_mask for one of the device resulted in a
boot hang due to a endless loop in clockevents_notify_released() as both
were clocksources were selected as preferred.

In order to prevent such issues in the future, warn if any clockevent
driver sets cpu_all_mask as it's cpumask and just override it to use
cpu_possible_mask. All the existing occurrences of cpu_all_mask are already
replaced with cpu_possible_mask.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lkml.kernel.org/r/1531308264-24220-3-git-send-email-sudeep.holla@arm.com

---
 kernel/time/clockevents.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 16c027e9cc73..8c0e4092f661 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -463,6 +463,12 @@ void clockevents_register_device(struct clock_event_device *dev)
 		dev->cpumask = cpumask_of(smp_processor_id());
 	}
 
+	if (dev->cpumask == cpu_all_mask) {
+		WARN(1, "%s cpumask == cpu_all_mask, using cpu_possible_mask instead\n",
+		     dev->name);
+		dev->cpumask = cpu_possible_mask;
+	}
+
 	raw_spin_lock_irqsave(&clockevents_lock, flags);
 
 	list_add(&dev->list, &clockevent_devices);