linux-kernel - Re: [PATCH 6/6] ppc: ebpf/jit: Implement JIT compiler for extended BPF

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Message-Id: <20160609060752.GQ18654@naverao1-tp.localdomain>
Date:	Thu, 9 Jun 2016 11:37:52 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Nilay Vaish <nilayvaish@...il.com>
Cc:	Daniel Borkmann <daniel@...earbox.net>,
	Matt Evans <matt@...abs.org>, Alexei Starovoitov <ast@...com>,
	netdev@...r.kernel.org, Denis Kirjanov <kda@...ux-powerpc.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"David S. Miller" <davem@...emloft.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [PATCH 6/6] ppc: ebpf/jit: Implement JIT compiler for extended
 BPF

On 2016/06/08 10:19PM, Nilay Vaish wrote:
> Naveen, can you point out where in the patch you update the variable:
> idx, a member of codegen_contex structure?  Somehow I am unable to
> figure it out.  I can only see that we set it to 0 in the
> bpf_int_jit_compile function.  Since all your test cases pass, I am
> clearly overlooking something.

Yes, that's being done in bpf_jit.h (see the earlier patches in the 
series). All the PPC_*() instruction macros are defined to EMIT() the 
respective powerpc instruction encoding.  EMIT() translates to 
PLANT_INSTR(), which actually increments idx.

- Naveen