[PATCH v2 6/8] arm: allow passing an ELF64 header to elf_check_arch()

From: adrian.wenl@gmail.com (Lei Wen)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 6/8] arm: allow passing an ELF64 header to elf_check_arch()
Date: Wed, 25 Aug 2010 10:40:45 +0800	[thread overview]
Message-ID: <AANLkTim761FFWZoyL1hJmAA6ArROB4KukXTEX+yh4VNY@mail.gmail.com> (raw)
In-Reply-To: <20100716081405.GR4247@esdhcp04058.research.nokia.com>

Hi Mika,

I have tried your patch, and it works perfect.
But there is something  inconvenient  that I have to modify the
PHYS_OFFSET and mach/Makefile.boot
manually if I want to get a kdump capable kernel.

How about add additional configuration like CONFIG_RELOCATABLE
CONFIG_PHYSICAL_STARTas x86?
This would do great help for formal usage.

Thanks,
Lei

On Fri, Jul 16, 2010 at 4:14 PM, Mika Westerberg
<ext-mika.1.westerberg@nokia.com> wrote:
> On Mon, May 10, 2010 at 02:21:56PM +0200, ext Russell King - ARM Linux wrote:
>> On Mon, May 10, 2010 at 03:09:20PM +0300, Mika Westerberg wrote:
> [...]
>> > I really don't know but fs/proc/vmcore.c is coded in such way that it supports
>> > both types of ELF headers. It however, passes the header to elf_check_arch()
>> > which in our case should fail if it is something else than ELF32 header.
>>
>> There's other arches which want elf_check_arch to be a function call, so
>> I think my question needs to be looked at more closely - and possibly
>> the code changed such that we don't end up with this situation.
>>
>> Maybe a cleaner solution would be for vmcore.c to split its calls to
>> elf_check_arch() - to be elf32_check_arch() and elf64_check_arch() ?
>> Platforms where it's just a macro can define both to be elf_check_arch()
>> but those where only one flavour is supported should define the unsupported
>> flavour to zero - which incidentally would allow the compiler to optimize
>> away the unnecessary parts of parse_crash_elf*_headers().
>
> Russell,
>
> I noticed that you applied all the kdump patches except this and the
> CONFIG_CRASH_DUMP patch. Thanks.
>
> Should I update this patch as you describe above? So that we don't need to
> perform any casting but just have elf_check_arch() separated into 32- and 64-bit
> versions. Or is there something else preventing these 2 patches to be merged?
>
> Thanks,
> MW
>
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