Once stop_machine() is gone from the CPU offline path, we won't be able
to depend on disabling preemption to prevent CPUs from going offline
from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
offline, while invoking from atomic context.
Cc: Mike Frysinger <vap...@gentoo.org>
Cc: Bob Liu <lliu...@gmail.com>
Cc: Steven Miao <real...@gmail.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: uclinux-dist-de...@blackfin.uclinux.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.b...@linux.vnet.ibm.com>
---
arch/blackfin/mach-common/smp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 1bc2ce6..11496cd 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -238,13 +238,13 @@ void smp_send_stop(void)
{
cpumask_t callmap;
- preempt_disable();
+ get_online_cpus_atomic();
cpumask_copy(&callmap, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &callmap);
if (!cpumask_empty(&callmap))
send_ipi(&callmap, BFIN_IPI_CPU_STOP);
- preempt_enable();
+ put_online_cpus_atomic();
return;
}
--
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