Re: [RFC v5 33/38] powerpc: Deliver SEGV signal on pkey violation

[Anshuman Khandual]

On 07/06/2017 02:52 AM, Ram Pai wrote:
> The value of the AMR register at the time of exception
> is made available in gp_regs[PT_AMR] of the siginfo.
> 
> The value of the pkey, whose protection got violated,
> is made available in si_pkey field of the siginfo structure.
> 
> Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
> ---
>  arch/powerpc/include/uapi/asm/ptrace.h |    3 ++-
>  arch/powerpc/kernel/signal_32.c        |    5 +++++
>  arch/powerpc/kernel/signal_64.c        |    4 ++++
>  arch/powerpc/kernel/traps.c            |   14 ++++++++++++++
>  4 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h
> index 8036b38..7ec2428 100644
> --- a/arch/powerpc/include/uapi/asm/ptrace.h
> +++ b/arch/powerpc/include/uapi/asm/ptrace.h
> @@ -108,8 +108,9 @@ struct pt_regs {
>  #define PT_DAR	41
>  #define PT_DSISR 42
>  #define PT_RESULT 43
> -#define PT_DSCR 44
>  #define PT_REGS_COUNT 44
> +#define PT_DSCR 44
> +#define PT_AMR	45

Why PT_DSCR was moved down ? This change is redundant here.