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

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Date:   Fri, 30 Oct 2020 16:19:07 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Andreas Schwab <schwab@...ux-m68k.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/32s: Setup the early hash table at all time.

Andreas Schwab <schwab@...ux-m68k.org> writes:
> 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.

Do you get an oops or anything?

cheers