From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Christophe Leroy <christophe.leroy@c-s.fr>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] powerpc/32s: reorder Linux PTE bits to better match Hash PTE bits.
Date: Thu, 26 Mar 2020 23:06:41 +1100 (AEDT) [thread overview]
Message-ID: <48p3cd3rbBz9sRY@ozlabs.org> (raw)
In-Reply-To: <c4d6c18a7f8d9d3b899bc492f55fbc40ef38896a.1583861325.git.christophe.leroy@c-s.fr>
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@c-s.fr>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/697ece78f8f749aeea40f2711389901f0974017a
cheers
prev parent reply other threads:[~2020-03-26 12:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-10 17:29 [PATCH v3] powerpc/32s: reorder Linux PTE bits to better match Hash PTE bits Christophe Leroy
2020-03-10 17:29 ` Christophe Leroy
2020-03-26 12:06 ` Michael Ellerman [this message]
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