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Commit 31aaa98c authored by David Ahern's avatar David Ahern Committed by David S. Miller
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sparc: Touch NMI watchdog when walking cpus and calling printk 



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: default avatarDavid Ahern <david.ahern@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b5aff55d

arch/sparc/kernel/process_64.c

+4 −0
Original line number Diff line number Diff line
@@ -287,6 +287,8 @@ void arch_trigger_all_cpu_backtrace(bool include_self) 
			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));
@@ -362,6 +364,8 @@ 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));