[PATCH 3.13.y-ckt 145/156] sparc: Touch NMI watchdog when walking cpus and calling printk
Kamal Mostafa
kamal at canonical.com
Tue Apr 7 22:51:22 UTC 2015
3.13.11-ckt19 -stable review patch. If anyone has any objections, please let me know.
------------------
From: David Ahern <david.ahern at oracle.com>
[ Upstream commit 31aaa98c248da766ece922bbbe8cc78cfd0bc920 ]
With the increase in number of CPUs calls to functions that dump
output to console (e.g., arch_trigger_all_cpu_backtrace) can take
a long time to complete. If IRQs are disabled eventually the NMI
watchdog kicks in and creates more havoc. Avoid by telling the NMI
watchdog everything is ok.
Signed-off-by: David Ahern <david.ahern at oracle.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
arch/sparc/kernel/process_64.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index c6f7113..1a79d68 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -281,6 +281,8 @@ void arch_trigger_all_cpu_backtrace(void)
printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
gp->tpc, gp->o7, gp->i7, gp->rpc);
}
+
+ touch_nmi_watchdog();
}
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
@@ -356,6 +358,8 @@ static void pmu_snapshot_all_cpus(void)
(cpu == this_cpu ? '*' : ' '), cpu,
pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
+
+ touch_nmi_watchdog();
}
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
--
1.9.1
More information about the kernel-team
mailing list