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

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Message-ID: <87v9esaxlv.fsf@igel.home>
Date:   Fri, 30 Oct 2020 10:09:48 +0100
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        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.

On Okt 30 2020, Michael Ellerman wrote:

> 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?

Nope, nothing at all.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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