| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.19 004/123] sparc: Touch NMI watchdog when walking cpus and calling printk | Date | Tue, 24 Mar 2015 16:45:13 +0100 |
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3.19-stable review patch. If anyone has any objections, please let me know.
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From: David Ahern <david.ahern@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@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/sparc/kernel/process_64.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -287,6 +287,8 @@ void arch_trigger_all_cpu_backtrace(bool 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));
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