Once stop_machine() is gone from the CPU offline path, we won't be able to
depend on preempt_disable() or local_irq_disable() 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: "James E.J. Bottomley" <j...@parisc-linux.org>
Cc: linux-par...@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.b...@linux.vnet.ibm.com>
---
arch/parisc/kernel/smp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 6266730..f7851b7 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -229,11 +229,13 @@ static inline void
send_IPI_allbutself(enum ipi_message_type op)
{
int i;
-
+
+ get_online_cpus_atomic();
for_each_online_cpu(i) {
if (i != smp_processor_id())
send_IPI_single(i, op);
}
+ put_online_cpus_atomic();
}
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