From: Zi Shen Lim <zlim.lnx@gmail.com>
Date: Wed, 3 Dec 2014 08:38:01 +0000 (+0000)
Subject: arm64: bpf: lift restriction on last instruction
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~18^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51c9fbb1b146f3336a93d398c439b6fbfe5ab489;p=pandora-kernel.git

arm64: bpf: lift restriction on last instruction

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")
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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