This is a note to let you know that I've just added the patch titled
sparc: Touch NMI watchdog when walking cpus and calling printk
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sparc-touch-nmi-watchdog-when-walking-cpus-and-calling-printk.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Mar 24 10:57:46 CET 2015
From: David Ahern <david.ahern@xxxxxxxxxx>
Date: Thu, 19 Mar 2015 16:06:53 -0400
Subject: sparc: Touch NMI watchdog when walking cpus and calling printk
From: David Ahern <david.ahern@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -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));
Patches currently in stable-queue which might be from david.ahern@xxxxxxxxxx are
queue-3.10/sparc64-fix-several-bugs-in-memmove.patch
queue-3.10/sparc-perf-make-counting-mode-actually-work.patch
queue-3.10/sparc-touch-nmi-watchdog-when-walking-cpus-and-calling-printk.patch
queue-3.10/sparc-perf-remove-redundant-perf_pmu_-en-dis-able-calls.patch
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