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Revert "powerpc/64s: Remove PROT_SAO support"

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This reverts commit 5c9fa16e8a.

Since PROT_SAO can still be useful for certain classes of software,
reintroduce it. Concerns about guest migration for LPARs using SAO
will be addressed next.

Signed-off-by: Shawn Anastasio <shawn@anastas.io>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200821185558.35561-2-shawn@anastas.io
This commit is contained in:
Shawn Anastasio
2020-08-21 13:55:56 -05:00
committed by Michael Ellerman
parent 64ef8f2c47
commit 12564485ed
13 changed files with 90 additions and 17 deletions
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2
arch/powerpc/include/uapi/asm/mman.h
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@@ -11,7 +11,7 @@
#include <asm-generic/mman-common.h>
#define PROT_SAO 0x10 /* Unsupported since v5.9 */
#define PROT_SAO 0x10 /* Strong Access Ordering */
#define MAP_RENAME MAP_ANONYMOUS /* In SunOS terminology */
#define MAP_NORESERVE 0x40 /* don't reserve swap pages */