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powerpc/mm: Allow platforms to redefine some helpers

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The 40xx defines _PAGE_HWWRITE while others don't.
The 8xx defines _PAGE_RO instead of _PAGE_RW.
The 8xx defines _PAGE_PRIVILEGED instead of _PAGE_USER.
The 8xx defines _PAGE_HUGE and _PAGE_NA while others don't.

Lets those platforms redefine pte_write(), pte_wrprotect() and
pte_mkwrite() and get _PAGE_RO and _PAGE_HWWRITE off the common
helpers.

Lets the 8xx redefine pte_user(), pte_mkprivileged() and pte_mkuser()
and get rid of _PAGE_PRIVILEGED and _PAGE_USER default values.

Lets the 8xx redefine pte_mkhuge() and get rid of
_PAGE_HUGE default value.

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2018-10-09 13:52:12 +00:00
committed by Michael Ellerman
parent 6c5d2d3fd3
commit a0da4bc166
6 changed files with 91 additions and 44 deletions
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4
arch/powerpc/include/asm/nohash/64/pgtable.h
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@@ -90,11 +90,7 @@
*/
#include <asm/nohash/pte-book3e.h>
#define _PAGE_HWWRITE 0
#define _PAGE_SAO 0
#define _PAGE_RO 0
#define _PAGE_NA 0
#define _PAGE_HUGE 0
#define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))