This is a note to let you know that I've just added the patch titled
MIPS: Fix kernel lockup or crash after CPU offline/online
to the 3.14-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:
mips-fix-kernel-lockup-or-crash-after-cpu-offline-online.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c7754e75100ed5e3068ac5085747f2bfc386c8d6 Mon Sep 17 00:00:00 2001
From: Hemmo Nieminen <hemmo.nieminen@xxxxxx>
Date: Thu, 15 Jan 2015 23:01:59 +0200
Subject: MIPS: Fix kernel lockup or crash after CPU offline/online
From: Hemmo Nieminen <hemmo.nieminen@xxxxxx>
commit c7754e75100ed5e3068ac5085747f2bfc386c8d6 upstream.
As printk() invocation can cause e.g. a TLB miss, printk() cannot be
called before the exception handlers have been properly initialized.
This can happen e.g. when netconsole has been loaded as a kernel module
and the TLB table has been cleared when a CPU was offline.
Call cpu_report() in start_secondary() only after the exception handlers
have been initialized to fix this.
Without the patch the kernel will randomly either lockup or crash
after a CPU is onlined and the console driver is a module.
Signed-off-by: Hemmo Nieminen <hemmo.nieminen@xxxxxx>
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Cc: David Daney <david.daney@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/8953/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/smp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -109,10 +109,10 @@ asmlinkage void start_secondary(void)
else
#endif /* CONFIG_MIPS_MT_SMTC */
cpu_probe();
- cpu_report();
per_cpu_trap_init(false);
mips_clockevent_init();
mp_ops->init_secondary();
+ cpu_report();
/*
* XXX parity protection should be folded in here when it's converted
Patches currently in stable-queue which might be from hemmo.nieminen@xxxxxx are
queue-3.14/mips-fix-kernel-lockup-or-crash-after-cpu-offline-online.patch
queue-3.14/mips-octeon-fix-kernel-crash-when-offlining-a-cpu.patch
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