[PATCH 4.9 45/72] parisc: Avoid stalled CPU warnings after system shutdown

Greg Kroah-Hartman
2017-04-06T09:21:32Z

From: Helge Deller <deller@gmx.de>

commit 476e75a44b56038bee9207242d4bc718f6b4de06 upstream.

Commit 73580dac7618 ("parisc: Fix system shutdown halt") introduced an endless
loop for systems which don't provide a software power off function. But the
soft lockup detector will detect this and report stalled CPUs after some time.
Avoid those unwanted warnings by disabling the soft lockup detector.

Fixes: 73580dac7618 ("parisc: Fix system shutdown halt")
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/parisc/kernel/process.c | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -140,6 +140,8 @@ void machine_power_off(void)
printk(KERN_EMERG "System shut down completed.\n"
"Please power this system off now.");

+ /* prevent soft lockup/stalled CPU messages for endless loop. */
+ rcu_sysrq_start();
for (;;);
}