linux-kernel - Re: [PATCH] powerpc/8xx: Fix permanently mapped IMMR region.

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Message-ID: <20191119184948.Horde.Roz3CrP_eBhY_YnNAgMQ7w1@messagerie.si.c-s.fr>
Date:   Tue, 19 Nov 2019 18:49:48 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] powerpc/8xx: Fix permanently mapped IMMR region.

Michael Ellerman <mpe@...erman.id.au> a écrit :

> Christophe Leroy <christophe.leroy@....fr> writes:
>> When not using large TLBs, the IMMR region is still
>> mapped as a whole block in the FIXMAP area.
>>
>> Do not remove pages mapped in the FIXMAP region when
>> initialising paging.
>>
>> Properly report that the IMMR region is block-mapped even
>> when not using large TLBs.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>> ---
>>  arch/powerpc/mm/mem.c        |  8 --------
>>  arch/powerpc/mm/nohash/8xx.c | 13 +++++++------
>>  2 files changed, 7 insertions(+), 14 deletions(-)
>
> This blows up pmac32_defconfig + qemu mac99 for me with:

Ok, then there is still something I have not understood about fixmap.  
I'll look at it next week

Christophe