linux-kernel - Re: [PATCH 0/5] PPC32/ioremap: Use memblock API to check for RAM

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Date:   Fri, 23 Feb 2018 09:01:17 +0100
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>, linux-mm@...ck.org,
        Joel Stanley <joel@....id.au>
Subject: Re: [PATCH 0/5] PPC32/ioremap: Use memblock API to check for RAM



Le 22/02/2018 à 13:15, Jonathan Neuschäfer a écrit :
> This patchset solves the same problem as my previous one[1] but follows
> a rather different approach. Instead of implementing DISCONTIGMEM for
> PowerPC32, I simply switched the "is this RAM" check in __ioremap_caller
> to the existing page_is_ram function, and unified page_is_ram to search
> memblock.memory on PPC64 and PPC32.
> 
> The intended result is, as before, that my Wii can allocate the MMIO
> range of its GPIO controller, which was previously not possible, because
> the reserved memory hack (__allow_ioremap_reserved) didn't affect the
> API in kernel/resource.c.
> 
> Thanks to Christophe Leroy for reviewing the previous patchset.

I tested your new serie, it doesn't break my 8xx so it is OK for me.

Christophe

> 
> [1]: https://www.spinics.net/lists/kernel/msg2726786.html
> 
> Jonathan Neuschäfer (5):
>    powerpc: mm: Simplify page_is_ram by using memblock_is_memory
>    powerpc: mm: Use memblock API for PPC32 page_is_ram
>    powerpc/mm/32: Use page_is_ram to check for RAM
>    powerpc: wii: Don't rely on the reserved memory hack
>    powerpc/mm/32: Remove the reserved memory hack
> 
>   arch/powerpc/mm/init_32.c                |  5 -----
>   arch/powerpc/mm/mem.c                    | 12 +-----------
>   arch/powerpc/mm/mmu_decl.h               |  1 -
>   arch/powerpc/mm/pgtable_32.c             |  4 +---
>   arch/powerpc/platforms/embedded6xx/wii.c | 14 +-------------
>   5 files changed, 3 insertions(+), 33 deletions(-)
>