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sparc: Touch NMI watchdog when walking cpus and calling printk

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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>
This commit is contained in:
David Ahern 2015-03-19 16:06:53 -04:00 • committed by David S. Miller
commit 31aaa98c24
1 changed files with 4 additions and 0 deletions
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4
arch/sparc/kernel/process_64.c
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@ -287,6 +287,8 @@ void arch_trigger_all_cpu_backtrace(bool include_self)
printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
gp->tpc, gp->o7, gp->i7, gp->rpc); gp->tpc, gp->o7, gp->i7, gp->rpc);
} }
touch_nmi_watchdog();
} }
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
@ -362,6 +364,8 @@ static void pmu_snapshot_all_cpus(void)
(cpu == this_cpu ? '*' : ' '), cpu, (cpu == this_cpu ? '*' : ' '), cpu,
pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[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)); memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));