[PATCH 03/25] powerpc: track allocation status of all pkeys

[Michael Ellerman]

Ram Pai <linuxram at us.ibm.com> writes:

> 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.
>
> Signed-off-by: Ram Pai <linuxram at us.ibm.com>
> ---
>  arch/powerpc/include/asm/book3s/64/mmu.h |    9 ++++
>  arch/powerpc/include/asm/mmu_context.h   |    1 +
>  arch/powerpc/include/asm/pkeys.h         |   72 ++++++++++++++++++++++++++++--
>  arch/powerpc/mm/mmu_context_book3s64.c   |    2 +
>  arch/powerpc/mm/pkeys.c                  |   28 ++++++++++++
>  5 files changed, 108 insertions(+), 4 deletions(-)

This doesn't build for me, with pseries_le_defconfig. I assume it built
for you. So something has changed upstream maybe?


In file included from ../include/linux/pkeys.h:8:0,
                 from ../mm/mprotect.c:26:
../mm/mprotect.c: In function ‘do_mprotect_pkey’:
../arch/powerpc/include/asm/pkeys.h:27:29: error: ‘VM_PKEY_BIT0’ undeclared (first use in this function)
 #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
                             ^
../mm/mprotect.c:470:6: note: in expansion of macro ‘ARCH_VM_PKEY_FLAGS’
      ARCH_VM_PKEY_FLAGS;
      ^~~~~~~~~~~~~~~~~~
../arch/powerpc/include/asm/pkeys.h:27:29: note: each undeclared identifier is reported only once for each function it appears in
 #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
                             ^
../mm/mprotect.c:470:6: note: in expansion of macro ‘ARCH_VM_PKEY_FLAGS’
      ARCH_VM_PKEY_FLAGS;
      ^~~~~~~~~~~~~~~~~~
../arch/powerpc/include/asm/pkeys.h:27:44: error: ‘VM_PKEY_BIT1’ undeclared (first use in this function)
 #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
                                            ^
../mm/mprotect.c:470:6: note: in expansion of macro ‘ARCH_VM_PKEY_FLAGS’
      ARCH_VM_PKEY_FLAGS;
      ^~~~~~~~~~~~~~~~~~
../arch/powerpc/include/asm/pkeys.h:27:59: error: ‘VM_PKEY_BIT2’ undeclared (first use in this function)
 #define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
                                                           ^
../mm/mprotect.c:470:6: note: in expansion of macro ‘ARCH_VM_PKEY_FLAGS’
      ARCH_VM_PKEY_FLAGS;
      ^~~~~~~~~~~~~~~~~~
../arch/powerpc/include/asm/pkeys.h:28:5: error: ‘VM_PKEY_BIT3’ undeclared (first use in this function)
     VM_PKEY_BIT3 | VM_PKEY_BIT4)
     ^
../mm/mprotect.c:470:6: note: in expansion of macro ‘ARCH_VM_PKEY_FLAGS’
      ARCH_VM_PKEY_FLAGS;
      ^~~~~~~~~~~~~~~~~~
../arch/powerpc/include/asm/pkeys.h:28:20: error: ‘VM_PKEY_BIT4’ undeclared (first use in this function)
     VM_PKEY_BIT3 | VM_PKEY_BIT4)
                    ^
../mm/mprotect.c:470:6: note: in expansion of macro ‘ARCH_VM_PKEY_FLAGS’
      ARCH_VM_PKEY_FLAGS;
      ^~~~~~~~~~~~~~~~~~
../scripts/Makefile.build:311: recipe for target 'mm/mprotect.o' failed


cheers