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| author |   Nicholas Piggin <npiggin@gmail.com> | 2020-07-03 11:19:57 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-07-22 00:01:25 +1000 |
| commit | 5c9fa16e8abd342ce04dc830c1ebb2a03abf6c05 (patch) | |
| tree | ee54ef37787256227a5e2929a888951a8524f5ac /include/linux/mm.h | |
| parent | powerpc: Remove stale calc_vm_prot_bits() comment (diff) | |
| download | wireguard-linux-5c9fa16e8abd342ce04dc830c1ebb2a03abf6c05.tar.xz wireguard-linux-5c9fa16e8abd342ce04dc830c1ebb2a03abf6c05.zip | |
powerpc/64s: Remove PROT_SAO support
ISA v3.1 does not support the SAO storage control attribute required to
implement PROT_SAO. PROT_SAO was used by specialised system software
(Lx86) that has been discontinued for about 7 years, and is not thought
to be used elsewhere, so removal should not cause problems.
We rather remove it than keep support for older processors, because
live migrating guest partitions to newer processors may not be possible
if SAO is in use (or worse allowed with silent races).
- PROT_SAO stays in the uapi header so code using it would still build.
- arch_validate_prot() is removed, the generic version rejects PROT_SAO
so applications would get a failure at mmap() time.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Drop KVM change for the time being]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200703011958.1166620-3-npiggin@gmail.com
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index dc7b87310c10..6c8333d6c991 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -317,8 +317,6 @@ 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) |