linux-kernel - Re: [PATCH] powerpc/32: disable KASAN with pages bigger than 16k

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Date:   Tue,  9 Jun 2020 15:28:44 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/32: disable KASAN with pages bigger than 16k

On Thu, 28 May 2020 10:17:04 +0000 (UTC), Christophe Leroy wrote:
> Mapping of early shadow area is implemented by using a single static
> page table having all entries pointing to the same early shadow page.
> The shadow area must therefore occupy full PGD entries.
> 
> The shadow area has a size of 128Mbytes starting at 0xf8000000.
> With 4k pages, a PGD entry is 4Mbytes
> With 16k pages, a PGD entry is 64Mbytes
> With 64k pages, a PGD entry is 256Mbytes which is too big.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/32: Disable KASAN with pages bigger than 16k
      https://git.kernel.org/powerpc/c/888468ce725a4cd56d72dc7e5096078f7a9251a0

cheers