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Date: Wed, 29 Jan 2020 16:17:28 +1100 (AEDT)
From: Michael Ellerman <>
To: Russell Currey <>,
Cc:,,, Russell Currey <>
Subject: Re: [PATCH 1/2] powerpc/book3s64/hash: Disable 16M linear mapping size if not aligned

On Tue, 2019-12-24 at 06:41:25 UTC, Russell Currey wrote:
> With STRICT_KERNEL_RWX on in a relocatable kernel under the hash MMU, if
> the position the kernel is loaded at is not 16M aligned, the kernel
> miscalculates its ALIGN*()s and things go horribly wrong.
> We can easily avoid this when selecting the linear mapping size, so do
> so and print a warning.  I tested this for various alignments and as
> long as the position is 64K aligned it's fine (the base requirement for
> powerpc).
> Signed-off-by: Russell Currey <>

Series applied to powerpc next, thanks.


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