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| author | David Ahern <david.ahern@oracle.com> | 2015-03-19 16:06:53 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 15:06:49 +0100 |
| commit | cdbe631ba36015f619ba716f48dc46e4455d836d (patch) | |
| tree | 05756789ce2f86d37bf3caa172b7f16c9117bea2 | |
| parent | c6bf6b54c72ecadd23107f83d8d23aac2b8bac83 (diff) | |
| download | lwn-cdbe631ba36015f619ba716f48dc46e4455d836d.tar.gz lwn-cdbe631ba36015f619ba716f48dc46e4455d836d.zip | |
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>
| -rw-r--r-- | arch/sparc/kernel/process_64.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index c6f7113b6e2f..1a79d6877981 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)); |