linux-kernel - Re: [PATCH] powerpc/32s: Setup the early hash table at all time.

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Message-ID: <30b6696d-b78e-cb95-6700-70b69e3947ba@csgroup.eu>
Date:   Sat, 7 Nov 2020 10:12:27 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/32s: Setup the early hash table at all time.



Le 29/10/2020 à 22:07, Andreas Schwab a écrit :
> On Okt 01 2020, Christophe Leroy wrote:
> 
>> At the time being, an early hash table is set up when
>> CONFIG_KASAN is selected.
>>
>> There is nothing wrong with setting such an early hash table
>> all the time, even if it is not used. This is a statically
>> allocated 256 kB table which lies in the init data section.
>>
>> This makes the code simpler and may in the future allow to
>> setup early IO mappings with fixmap instead of hard coding BATs.
>>
>> Put create_hpte() and flush_hash_pages() in the .ref.text section
>> in order to avoid warning for the reference to early_hash[]. This
>> reference is removed by MMU_init_hw_patch() before init memory is
>> freed.
> 
> This breaks booting on the iBook G4.
> 

Can you test patch 
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/9e225a856a8b22e0e77587ee22ab7a2f5bca8753.1604740029.git.christophe.leroy@csgroup.eu/

Thanks
Christophe