linux-kernel - Re: [PATCH] m68k: mm: Move initrd phys_to_virt handling after paging

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Message-ID: <f0877485-16df-1bda-c935-5ef56afacc8d@linux-m68k.org>
Date:   Tue, 28 Feb 2023 09:48:41 +1100 (AEDT)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Mike Rapoport <rppt@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Stephen Walsh <vk3heg@...heg.net>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
cc:     linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k: mm: Move initrd phys_to_virt handling after
 paging_init()

On Mon, 27 Feb 2023, Geert Uytterhoeven wrote:

> When booting with an initial ramdisk on platforms where physical memory
> does not start at address zero (e.g. on Amiga):
> 
>     initrd: 0ef0602c - 0f800000
>     Zone ranges:
>       DMA      [mem 0x0000000008000000-0x000000f7ffffffff]
>       Normal   empty
>     Movable zone start for each node
>     Early memory node ranges
>       node   0: [mem 0x0000000008000000-0x000000000f7fffff]
>     Initmem setup node 0 [mem 0x0000000008000000-0x000000000f7fffff]
>     Unable to handle kernel access at virtual address (ptrval)
>     Oops: 00000000
>     Modules linked in:
>     PC: [<00201d3c>] memcmp+0x28/0x56
> 
> As phys_to_virt() relies on m68k_memoffset and module_fixup(), it must
> not be called before paging_init().  Hence postpone the phys_to_virt
> handling for the initial ramdisk until after calling paging_init().
> 

Thanks for debugging this issue.

> While at it, reduce #ifdef clutter by using IS_ENABLED() instead.
> 
> Fixes: 376e3fdecb0dcae2 ("m68k: Enable memtest functionality")

I apologise for the trouble caused by that patch.