[PATCH] bpf, powerpc: fix jit for seccomp_data access

[Naveen N. Rao]

Mark Lord wrote:
> I am using SECCOMP to filter syscalls on a ppc32 platform,
> and noticed that the JIT compiler was failing on the BPF
> even though the interpreter was working fine.
> 
> The issue was that the compiler was missing one of the instructions
> used by SECCOMP, so here is a patch to enable JIT for that instruction.
> 
> Signed-Off-By:  Mark Lord <mlord at pobox.com>
> 
> --- old/arch/powerpc/net/bpf_jit_comp.c 2018-02-16 14:07:01.000000000 -0500
> +++ linux/arch/powerpc/net/bpf_jit_comp.c       2018-02-20 14:41:20.805227494 -0500
> @@ -329,6 +329,9 @@ static int bpf_jit_build_body(struct bpf
>                         BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, len) != 4);
>                         PPC_LWZ_OFFS(r_A, r_skb, offsetof(struct sk_buff, len));
>                         break;
> +               case BPF_LDX | BPF_W | BPF_ABS: /* A = *((u32 *)(seccomp_data + K)); */
> +                       PPC_LWZ_OFFS(r_A, r_skb, K);
> +                       break;

Looks good to me, but I am not able to apply this patch. There seems to 
be whitespace damage. Please resend the patch considering the steps 
here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/email-clients.rst

Thanks,
Naveen