linux-kernel - Re: [PATCH v5 04/13] powerpc: Factor out relocation code from module_64.c to elf_util

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Date:   Wed, 24 Aug 2016 10:50:26 +1000
From:   "Oliver O'Halloran" <oohall@...il.com>
To:     Balbir Singh <bsingharora@...il.com>
Cc:     Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>,
        kexec@...ts.infradead.org,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Baoquan He <bhe@...hat.com>, linuxppc-dev@...ts.ozlabs.org,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Young <dyoung@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH v5 04/13] powerpc: Factor out relocation code from
 module_64.c to elf_util_64.c.

On Tue, Aug 23, 2016 at 1:21 PM, Balbir Singh <bsingharora@...il.com> wrote:
>
>> zImage on ppc64 BE is an ELF32 file. This patch set only supports loading
>> ELF files of the same class as the kernel, so a 64 bit kernel can't load an
>> ELF32 file. It would be possible to add such support, but it would be a new
>> feature.
>>
>> The distros I was able to check on ppc64 LE and BE all use vmlinux.
>> kexec-tools with kexec_load also doesn't support zImage. Do you think it is
>> important to support zImage?
>
> Well if it didn't work already, I think its low priority. Michael should be
> able to confirm this. Oliver's been trying to cleanup the zImage to get rid
> the old zImage limitation, cc'ing him

I don't think it's ever worked so I wouldn't worry too much about
supporting it. Fixing kexec-into-zImage and fixing the 32bit wrapper
on 64bit BE kernel problem has been on my TODO list for a while, but
it's not a priority.

oliver