linux-kernel - Re: -git: BUG: unable to handle kernel paging request at c0100248 [CPU hotplug]

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Message-ID: <19f34abd0807271240x71fb85e3qae5d7beaad6eaba3@mail.gmail.com>
Date:	Sun, 27 Jul 2008 21:40:46 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Thomas Meyer" <thomas@...3r.de>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: -git: BUG: unable to handle kernel paging request at c0100248 [CPU hotplug]

On Sun, Jul 27, 2008 at 9:35 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> On Sun, Jul 27, 2008 at 9:23 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> On Sun, 27 Jul 2008, Vegard Nossum wrote:
>>> Booting processor 1/1 ip 6000
>>> Initializing CPU#1
>>> [...]
>>> Write protecting the kernel text: 5648k
>>>
>>> So it succeeds because the protection happens much later :-)
>>
>> Patch below fixes the issue. I get it to Linus ASAP.
>
> Nice :)
>
> [...]
>
>> +.section .cpuinit.data,"wa"
>> +.align 4
>> +ENTRY(initial_code)
>> +       .long i386_start_kernel
>> +
>>  .section .text
>>  /*
>>  * Real beginning of normal "text" segment
>>
>
> Hm, isn't there some kind of "section stack" that can be used to
> restore the previous section? .pushsection/.popsection directives?

Oh, never mind :-)

(Sorry for the noise.)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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