powerpc/32s: reorder Linux PTE bits to better match Hash PTE bits.

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c4d6c18a7f8d9d3b899bc492f55fbc40ef38896a.1583861325.git.christophe.leroy@c-s.fr

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This commit is contained in:

Christophe Leroy 2020-03-10 17:29:12 +00:00 • committed by Michael Ellerman

parent af92bad615

commit 697ece78f8

3 changed files with 13 additions and 18 deletions

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8

arch/powerpc/include/asm/book3s/32/hash.h

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9

arch/powerpc/kernel/head_32.S

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14

arch/powerpc/mm/book3s32/hash_low.S

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