From 826e99be6ab5189dbfb096389016ffb8d20a683e Mon Sep 17 00:00:00 2001
From: James Hogan <james.hogan@imgtec.com>
Date: Wed, 13 Jul 2016 14:12:45 +0100
Subject: MIPS: SMP: Update cpu_foreign_map on CPU disable
When a CPU is disabled via CPU hotplug, cpu_foreign_map is not updated.
This could result in cache management SMP calls being sent to offline
CPUs instead of online siblings in the same core.
Add a call to calculate_cpu_foreign_map() in the various MIPS cpu
disable callbacks after set_cpu_online(). All cases are updated for
consistency and to keep cpu_foreign_map strictly up to date, not just
those which may support hardware multithreading.
Fixes: cccf34e9411c ("MIPS: c-r4k: Fix cache flushing for MT cores")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Hongliang Tao <taohl@lemote.com>
Cc: Hua Yan <yanh@lemote.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13799/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/cavium-octeon/smp.c | 1 +
1 file changed, 1 insertion(+)
(limited to 'arch/mips/cavium-octeon')
diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
index 33aab89259f3..4d457d602d3b 100644
--- a/arch/mips/cavium-octeon/smp.c
+++ b/arch/mips/cavium-octeon/smp.c
@@ -271,6 +271,7 @@ static int octeon_cpu_disable(void)
return -ENOTSUPP;
set_cpu_online(cpu, false);
+ calculate_cpu_foreign_map();
cpumask_clear_cpu(cpu, &cpu_callin_map);
octeon_fixup_irqs();
--
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