linux-kernel - Re: [PATCH] m68k: Implement kernel memory protection

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Message-ID: <CAFr9PXkzhEEsSUXWCtpHaX6DWEKzX=xCESSpzbSFoJgf8mrz4A@mail.gmail.com>
Date: Mon, 17 Nov 2025 18:42:25 +0900
From: Daniel Palmer <daniel@...ngy.jp>
To: Greg Ungerer <gerg@...nel.org>
Cc: geert@...ux-m68k.org, linux-m68k@...ts.linux-m68k.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k: Implement kernel memory protection

Hi Greg,

On Mon, 17 Nov 2025 at 12:04, Greg Ungerer <gerg@...nel.org> wrote:
> Seems to work fine on real ColdFire hardware (tested on an M5475 -
> that is one that has an MMU):

Thanks for testing. I just tried on my MVME147 (030) and the marking
RO seems to work but it locks up starting init:

[    6.520000] devtmpfs: mounted
[    6.540000] Freeing unused kernel image (initmem) memory: 120K
[    6.550000] Write protecting kernel text: 0x2000 - 0x3676f0
[    6.560000] Write protecting kernel read-only data: 0x36a000 - 0x3be000
[    6.580000] rodata_test: all tests were successful
[    6.590000] Run /sbin/init as init process
<dead>

My 060 Amiga 4000 seems ok. So I guess some 030 mmu issue. I'll debug
and send again..

Thanks!

Daniel