Subject: Re: [PATCH] powerpc/32: Don't populate page tables for block mapped pages except on the 8xx.

From: Michael Ellerman <[email-masked]>
Date: Mon, 25 Nov 2019 21:46:58 +1100 (AEDT)

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 <[email-masked]>

Applied to powerpc next, thanks.

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

cheers