parisc: Avoid stalled CPU warnings after system shutdown

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>
Cc: stable@vger.kernel.org # 4.9+

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index b76f503..4516a5b 100644 (file)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -143,6 +143,8 @@ 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 (;;);
 }