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

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Message-ID: <87wnz8vizm.fsf@igel.home>
Date:   Thu, 29 Oct 2020 22:07:41 +0100
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
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.

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.

Andreas.

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