MIPS: Fix kernel lockup or crash after CPU offline/online
commit c7754e7510
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@iki.fi>
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8953/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -109,10 +109,10 @@ asmlinkage void start_secondary(void)
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else
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#endif /* CONFIG_MIPS_MT_SMTC */
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cpu_probe();
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cpu_report();
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per_cpu_trap_init(false);
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mips_clockevent_init();
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mp_ops->init_secondary();
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cpu_report();
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/*
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* XXX parity protection should be folded in here when it's converted
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