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Message-ID: <alpine.LFD.2.11.1501301242080.28301@eddie.linux-mips.org> Date: Fri, 30 Jan 2015 12:47:39 +0000 (GMT) From: "Maciej W. Rozycki" <macro@...ux-mips.org> To: James Hogan <james.hogan@...tec.com> cc: Aaro Koskinen <aaro.koskinen@....fi>, Ralf Baechle <ralf@...ux-mips.org>, David Daney <david.daney@...ium.com>, linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org, Hemmo Nieminen <hemmo.nieminen@....fi>, stable@...r.kernel.org Subject: Re: [PATCH v2 2/2] MIPS: fix kernel lockup or crash after CPU offline/online On Fri, 30 Jan 2015, James Hogan wrote: > > Hmm, why can a call to `printk' cause a TLB miss, what's so special about > > this function? Does it use kernel mapped addresses for any purpose such > > as `vmalloc'? > > It would be the fact netconsole (or whatever other console is in use) is > built as a kernel module, memory for which is allocated from the vmalloc > area. Ah, I see, thanks for enlightening me. But in that case wouldn't it be possible to postpone console output from `printk' until it is safe to access the device? In a manner similar to how for example we handle calls to `printk' made from the hardirq context. That would make things less fragile. Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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