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* [PATCH 4.9 02/83] MIPS: kernel: only use i8253 clocksource with periodic clockevent
       [not found] <20190904175303.488266791@linuxfoundation.org>
@ 2019-09-04 17:52 ` Greg Kroah-Hartman
  0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2019-09-04 17:52 UTC (permalink / raw)
  To: linux-kernel
  Cc: Greg Kroah-Hartman, stable, Thomas Bogendoerfer, Paul Burton,
	Ralf Baechle, James Hogan, linux-mips, Sasha Levin

[ Upstream commit a07e3324538a989b7cdbf2c679be6a7f9df2544f ]

i8253 clocksource needs a free running timer. This could only
be used, if i8253 clockevent is set up as periodic.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/mips/kernel/i8253.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index c5bc344fc745c..73039746ae364 100644
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -31,7 +31,8 @@ void __init setup_pit_timer(void)
 
 static int __init init_pit_clocksource(void)
 {
-	if (num_possible_cpus() > 1) /* PIT does not scale! */
+	if (num_possible_cpus() > 1 || /* PIT does not scale! */
+	    !clockevent_state_periodic(&i8253_clockevent))
 		return 0;
 
 	return clocksource_i8253_init();
-- 
2.20.1




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     [not found] <20190904175303.488266791@linuxfoundation.org>
2019-09-04 17:52 ` [PATCH 4.9 02/83] MIPS: kernel: only use i8253 clocksource with periodic clockevent Greg Kroah-Hartman

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