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In-Reply-To: <c8610942203e0d93fcb02ad20c57edd3adb4c9d3.1566554029.git.christophe.leroy@c-s.fr>
To:     Christophe Leroy <christophe.leroy@c-s.fr>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>
From:   Michael Ellerman <patch-notifications@ellerman.id.au>
Cc:     linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc/32: Don't populate page tables for block mapped pages except on the 8xx.
Message-Id: <47M3cy2crzz9sR1@ozlabs.org>
Date:   Mon, 25 Nov 2019 21:46:58 +1100 (AEDT)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, 2019-08-23 at 09:56:21 UTC, Christophe Leroy wrote:
> Commit d2f15e0979ee ("powerpc/32: always populate page tables for
> Abatron BDI.") wrongly sets page tables for any PPC32 for using BDI,
> and does't update them after init (remove RX on init section, set
> text and rodata read-only)
> 
> Only the 8xx requires page tables to be populated for using the BDI.
> They also need to be populated in order to see the mappings in
> /sys/kernel/debug/kernel_page_tables
> 
> On BOOK3S_32, pages that are not mapped by page tables are mapped
> by BATs. The BDI knows BATs and they can be viewed in
> /sys/kernel/debug/powerpc/block_address_translation
> 
> Only set pagetables for RAM and IMMR on the 8xx and properly update
> them at the end of init.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/a2227a27774328507a5c2335a6dd600c079d1ff5

cheers