linux-kernel - Re: [PATCH v3] powerpc/32s: reorder Linux PTE bits to better match Hash PTE bits.

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Message-Id: <48p3cd3rbBz9sRY@ozlabs.org>
Date:   Thu, 26 Mar 2020 23:06:41 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] powerpc/32s: reorder Linux PTE bits to better match Hash PTE bits.

On Tue, 2020-03-10 at 17:29:12 UTC, Christophe Leroy wrote:
> Reorder Linux PTE bits to (almost) match Hash PTE bits.
> 
> RW Kernel : PP = 00
> RO Kernel : PP = 00
> RW User   : PP = 01
> RO User   : PP = 11
> 
> So naturally, we should have
> _PAGE_USER = 0x001
> _PAGE_RW   = 0x002
> 
> Today 0x001 and 0x002 and _PAGE_PRESENT and _PAGE_HASHPTE which
> both are software only bits.
> 
> Switch _PAGE_USER and _PAGE_PRESET
> Switch _PAGE_RW and _PAGE_HASHPTE
> 
> This allows to remove a few insns.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/697ece78f8f749aeea40f2711389901f0974017a

cheers