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[222.152.219.123]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2986a60b116sm114206205ad.79.2025.11.17.09.41.10 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Nov 2025 09:41:13 -0800 (PST) Subject: Re: [PATCH] m68k: Implement kernel memory protection To: Daniel Palmer , Greg Ungerer References: <20251116220508.1513445-1-daniel@thingy.jp> Cc: geert@linux-m68k.org, linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org From: Michael Schmitz Message-ID: <126822f3-6f11-d02d-43f8-1b5e6bcc910a@gmail.com> Date: Tue, 18 Nov 2025 06:41:08 +1300 User-Agent: Mozilla/5.0 (X11; Linux ppc; rv:45.0) Gecko/20100101 Icedove/45.4.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Daniel, take a look at arch/m68k/kernel/head.S - 030 MMU setup uses early termination descriptors for kernel memory, _not_ regular page tables. Cheers, Michael Am 17.11.2025 um 22:42 schrieb Daniel Palmer: > Hi Greg, > > On Mon, 17 Nov 2025 at 12:04, Greg Ungerer 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 > > > My 060 Amiga 4000 seems ok. So I guess some 030 mmu issue. I'll debug > and send again.. > > Thanks! > > Daniel >