From 2f4f1f815bc6d03ea42d4f67dd1e284525e7524e Mon Sep 17 00:00:00 2001
From: chenhui zhao <chenhui.zhao@freescale.com>
Date: Fri, 20 Nov 2015 17:14:01 +0800
Subject: powerpc/mpc85xx: Add hotplug support on E5500 and E500MC cores
Freescale E500MC and E5500 core-based platforms, like P4080, T1040,
support disabling/enabling CPU dynamically.
This patch adds this feature on those platforms.
Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com>
Signed-off-by: Tang Yuantian <Yuantian.Tang@feescale.com>
[scottwood: removed unused pr_fmt]
Signed-off-by: Scott Wood <oss@buserror.net>
---
arch/powerpc/kernel/smp.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
(limited to 'arch/powerpc/kernel/smp.c')
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ec9ec2058d2d..8575d044775d 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -427,7 +427,7 @@ void generic_cpu_die(unsigned int cpu)
for (i = 0; i < 100; i++) {
smp_rmb();
- if (per_cpu(cpu_state, cpu) == CPU_DEAD)
+ if (is_cpu_dead(cpu))
return;
msleep(100);
}
@@ -454,6 +454,11 @@ int generic_check_cpu_restart(unsigned int cpu)
return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
}
+int is_cpu_dead(unsigned int cpu)
+{
+ return per_cpu(cpu_state, cpu) == CPU_DEAD;
+}
+
static bool secondaries_inhibited(void)
{
return kvm_hv_mode_active();
--
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