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Date: Tue, 13 Aug 2019 22:37:32 -0700
From: Christoph Hellwig <hch@infradead.org>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Subject: Re: [PATCH] powerpc/32s: fix boot failure with DEBUG_PAGEALLOC
 without KASAN.
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On Wed, Aug 14, 2019 at 05:28:35AM +0000, Christophe Leroy wrote:
> When KASAN is selected, the definitive hash table has to be
> set up later, but there is already an early temporary one.
> 
> When KASAN is not selected, there is no early hash table,
> so the setup of the definitive hash table cannot be delayed.

I think you also want to add this information to the code itself
as comments..