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* [PATCH AUTOSEL 4.9 02/33] MIPS: kernel: only use i8253 clocksource with periodic clockevent
       [not found] <20190814022323.17111-1-sashal@kernel.org>
@ 2019-08-14  2:22 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2019-08-14  2:22 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Thomas Bogendoerfer, Paul Burton, Ralf Baechle, James Hogan,
	linux-mips, Sasha Levin

From: Thomas Bogendoerfer <tbogendoerfer@suse.de>

[ 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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2019-08-14  2:22 ` [PATCH AUTOSEL 4.9 02/33] MIPS: kernel: only use i8253 clocksource with periodic clockevent Sasha Levin

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