linux-kernel - Re: STRICT_KERNEL_RWX on PPC32 is broken on PowerMac G4

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Date:   Tue, 21 Nov 2017 13:28:41 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     LEROY Christophe <christophe.leroy@....fr>
Cc:     Meelis Roos <mroos@...ux.ee>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: STRICT_KERNEL_RWX on PPC32 is broken on PowerMac G4

On Sun, Nov 19, 2017 at 1:36 AM, LEROY Christophe
<christophe.leroy@....fr> wrote:
> Meelis Roos <mroos@...ux.ee> a écrit :
>
>>> > > How early does it hang ? Any oops or trace ?
>>> >
>>> > Very early - instead oif kernel emssages, I see some repeated gibberish
>>> > of some characteers, and the background turns white.
>>> > I am booting from yaboot, background is normally black.
>>>
>>> Ok, could you try by replacing #ifdef CONFIG_STRICT_KERNEL_RWX by #if 0
>>> in arch/powerpc/lib/code-patching.c
>>
>>
>> With this change and CONFIG_STRICT_KERNEL_RWX=y, it still boots.
>>
>> BTW, I get these warnings (sorry for the word wrap from screen paste) -
>> may they be related or rather not?
>>
>>   WRAP    arch/powerpc/boot/zImage.pmac
>>   WRAP    arch/powerpc/boot/zImage.coff
>>   WRAP    arch/powerpc/boot/zImage.miboot
>> INFO: Uncompressed kernel (size 0x5d4c3c) overlaps the address of the
>> wrapper(0x400000)
>> INFO: Fixing the link_address of wrapper to (0x600000)
>>
>
> Then i believe there is something wrong with commit
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20171115&id=37bc3e5fd764fb258ff4fcbb90b6d1b67fb466c1
>
> Balbir, do you have any idea ?
>

Hmm.. interesting, so nobats works, but code-patching has issues? Any
chance you can boot with xmon=on on the command line
when you drop into the xmon> prompt, type dl to get the kernel log.

Balbir Singh.