diff options
| author | Ram Pai <linuxram@us.ibm.com> | 2018-01-18 17:50:25 -0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 22:58:35 +1100 |
| commit | 4fb158f65ac5556b9b4a6f63f38272853ed99b22 (patch) | |
| tree | 4ec2bfa69af9f93d48cedc54c2de08671c4a4c7d /arch/powerpc/include/asm/mmu_context.h | |
| parent | 92e3da3cf193fd27996909956c12a23c0333da44 (diff) | |
powerpc: track allocation status of all pkeys
Total 32 keys are available on power7 and above. However
pkey 0,1 are reserved. So effectively we have 30 pkeys.
On 4K kernels, we do not have 5 bits in the PTE to
represent all the keys; we only have 3bits. Two of those
keys are reserved; pkey 0 and pkey 1. So effectively we
have 6 pkeys.
This patch keeps track of reserved keys, allocated keys
and keys that are currently free.
Also it adds skeletal functions and macros, that the
architecture-independent code expects to be available.
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/mmu_context.h')
| -rw-r--r-- | arch/powerpc/include/asm/mmu_context.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index fb5e6a3ce127..7d0f2d05189b 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -193,5 +193,9 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, return true; } +#ifndef CONFIG_PPC_MEM_KEYS +#define pkey_mm_init(mm) +#endif /* CONFIG_PPC_MEM_KEYS */ + #endif /* __KERNEL__ */ #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |