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powerpc64/ftrace: Disable ftrace during hotplug

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Disable ftrace when a cpu is about to go offline. When the cpu is woken
up, ftrace will get enabled in start_secondary().

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao 2018-04-19 12:34:04 +05:30 • committed by Michael Ellerman
parent d103978636
commit 424ef0160f
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/kernel/smp.c
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@ -1166,6 +1166,8 @@ int __cpu_disable(void)
if (!smp_ops->cpu_disable) if (!smp_ops->cpu_disable)
return -ENOSYS; return -ENOSYS;
this_cpu_disable_ftrace();
err = smp_ops->cpu_disable(); err = smp_ops->cpu_disable();
if (err) if (err)
return err; return err;
@ -1184,6 +1186,12 @@ void __cpu_die(unsigned int cpu)
void cpu_die(void) void cpu_die(void)
{ {
/*
* Disable on the down path. This will be re-enabled by
* start_secondary() via start_secondary_resume() below
*/
this_cpu_disable_ftrace();
if (ppc_md.cpu_die) if (ppc_md.cpu_die)
ppc_md.cpu_die(); ppc_md.cpu_die();