Commit cbcbbf4a authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/mm: Define platform default caches related flags 



Cache related flags like _PAGE_COHERENT and _PAGE_WRITETHRU
are defined on most platforms. The platforms not defining
them don't define any alternative. So we can give them a NUL
value directly for those platforms directly.

Reviewed-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent a0da4bc1

arch/powerpc/include/asm/nohash/32/pte-40x.h

+3 −0
Original line number Diff line number Diff line
@@ -53,6 +53,9 @@ 
/* No page size encoding in the linux PTE */

#define _PAGE_PSIZE		0



/* cache related flags non existing on 40x */

#define _PAGE_COHERENT	0



#define _PAGE_KERNEL_RO		0

#define _PAGE_KERNEL_ROX	_PAGE_EXEC

#define _PAGE_KERNEL_RW		(_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)

arch/powerpc/include/asm/nohash/32/pte-8xx.h

+4 −0
Original line number Diff line number Diff line
@@ -46,6 +46,10 @@ 
#define _PAGE_NA	0x0200	/* Supervisor NA, User no access */

#define _PAGE_RO	0x0600	/* Supervisor RO, User no access */



/* cache related flags non existing on 8xx */

#define _PAGE_COHERENT	0

#define _PAGE_WRITETHRU	0



#define _PAGE_KERNEL_RO		(_PAGE_PRIVILEGED | _PAGE_RO)

#define _PAGE_KERNEL_ROX	(_PAGE_PRIVILEGED | _PAGE_RO | _PAGE_EXEC)

#define _PAGE_KERNEL_RW		(_PAGE_PRIVILEGED | _PAGE_DIRTY)

arch/powerpc/include/asm/pte-common.h

+0 −11
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/* Included from asm/pgtable-*.h only ! */



/*

 * Some bits are only used on some cpu families... Make sure that all

 * the undefined gets a sensible default

 */

#ifndef _PAGE_COHERENT

#define _PAGE_COHERENT	0

#endif

#ifndef _PAGE_WRITETHRU

#define _PAGE_WRITETHRU	0

#endif



/* Location of the PFN in the PTE. Most 32-bit platforms use the same

 * as _PAGE_SHIFT here (ie, naturally aligned).

 * Platform who don't just pre-define the value so we don't override it here

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