path: root/arch
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authorDavid Ahern <david.ahern@oracle.com>2015-03-19 16:06:53 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-26 15:00:55 +0100
commit146c982f2227ef6540db851b5bcc73d36d7e5c0e (patch)
tree2924fde4ae2ad98798be8cc385c478ac4775806e /arch
parentd42f5dffbce92064e44cc51ab4123a4384166145 (diff)
sparc: Touch NMI watchdog when walking cpus and calling printk
[ 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@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index b9cc9763faf4..036e43cef6fb 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -280,6 +280,8 @@ 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));
@@ -352,6 +354,8 @@ 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));