linux-kernel - Re: [PATCH] bpf: arm64: lift restriction on last instruction

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Date:	Wed, 3 Dec 2014 18:04:52 +0000
From:	Will Deacon <will.deacon@....com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Zi Shen Lim <zlim.lnx@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Network Development <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: arm64: lift restriction on last instruction

On Wed, Dec 03, 2014 at 03:54:32PM +0000, Alexei Starovoitov wrote:
> On Wed, Dec 3, 2014 at 12:38 AM, Zi Shen Lim <zlim.lnx@...il.com> wrote:
> > Earlier implementation assumed last instruction is BPF_EXIT.
> > Since this is no longer a restriction in eBPF, we remove this
> > limitation.
> >
> > Per Alexei Starovoitov [1]:
> >> classic BPF has a restriction that last insn is always BPF_RET.
> >> eBPF doesn't have BPF_RET instruction and this restriction.
> >> It has BPF_EXIT insn which can appear anywhere in the program
> >> one or more times and it doesn't have to be last insn.
> >
> > [1] https://lkml.org/lkml/2014/11/27/2
> >
> > Fixes: e54bcde3d69d ("arm64: eBPF JIT compiler")
> > Signed-off-by: Zi Shen Lim <zlim.lnx@...il.com>
> 
> yours is cleaner than my own attempt to fix it.
> Thanks!
> Acked-by: Alexei Starovoitov <ast@...mgrid.com>

Cheers, I've applied this for 3.19.

Will
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