diff options
| author | Ram Pai <linuxram@us.ibm.com> | 2018-01-18 17:50:33 -0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 22:59:01 +1100 |
| commit | 013a91b39c2d5158cdc5529803f245bbb0526c7c (patch) | |
| tree | dd2f86dc2e39316ea4f1bb2e689ec41fbf695480 /arch/powerpc/mm/pkeys.c | |
| parent | 5586cf61e108019565bb936daeb296e53df1c1d6 (diff) | |
powerpc: ability to associate pkey to a vma
arch-independent code expects the arch to map
a pkey into the vma's protection bit setting.
The patch provides that ability.
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pkeys.c')
| -rw-r--r-- | arch/powerpc/mm/pkeys.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c index 6fece6e6fc97..a4aac75f1a93 100644 --- a/arch/powerpc/mm/pkeys.c +++ b/arch/powerpc/mm/pkeys.c @@ -35,6 +35,14 @@ int pkey_initialize(void) (PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE)); /* + * pkey_to_vmflag_bits() assumes that the pkey bits are contiguous + * in the vmaflag. Make sure that is really the case. + */ + BUILD_BUG_ON(__builtin_clzl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT) + + __builtin_popcountl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT) + != (sizeof(u64) * BITS_PER_BYTE)); + + /* * Disable the pkey system till everything is in place. A subsequent * patch will enable it. */ |