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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
include/linux/mm.h
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@@ -321,6 +321,8 @@ extern unsigned int kobjsize(const void *objp);
#if defined(CONFIG_X86)
# define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */
#elif defined(CONFIG_PPC)
# define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */
#elif defined(CONFIG_PARISC)
# define VM_GROWSUP VM_ARCH_1
#elif defined(CONFIG_IA64)