[PATCH] xmon: Reset RCU and soft lockup watchdogs

I'm seeing RCU warnings when exiting xmon. xmon resets the NMI watchdog,
but does nothing with the RCU stall or soft lockup watchdogs. Add a
helper function that handles all three.

Signed-off-by: Anton Blanchard <redacted>
---
 arch/powerpc/xmon/xmon.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 7efe4bc3ccf6..d27944e38b04 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c

@@ -481,6 +481,13 @@ static inline int unrecoverable_excp(struct pt_regs *regs)
 #endif
 }
 
+static void xmon_touch_watchdogs(void)
+{
+	touch_softlockup_watchdog_sync();
+	rcu_cpu_stall_reset();
+	touch_nmi_watchdog();
+}
+
 static int xmon_core(struct pt_regs *regs, int fromipi)
 {
 	int cmd = 0;

@@ -718,7 +725,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
 	else
 		insert_cpu_bpts();
 
-	touch_nmi_watchdog();
+	xmon_touch_watchdogs();
 	local_irq_restore(flags);
 
 	return cmd != 'X' && cmd != EOF;

-- 
2.26.2

Excerpts from Anton Blanchard's message of June 30, 2020 10:02 am:

I'm seeing RCU warnings when exiting xmon. xmon resets the NMI watchdog,
but does nothing with the RCU stall or soft lockup watchdogs. Add a
helper function that handles all three.

Signed-off-by: Anton Blanchard <redacted>

Acked-by: Nicholas Piggin <npiggin@gmail.com>

On Tue, 30 Jun 2020 10:02:18 +1000, Anton Blanchard wrote:

I'm seeing RCU warnings when exiting xmon. xmon resets the NMI watchdog,
but does nothing with the RCU stall or soft lockup watchdogs. Add a
helper function that handles all three.

Applied to powerpc/next.

[1/1] powerpc/xmon: Reset RCU and soft lockup watchdogs
      https://git.kernel.org/powerpc/c/5c699396f5f6cf6d67055af7b82c270d31fd831a

cheers