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Sender: Rabin Vincent <rabin.vincent@gmail.com>
Date: Tue, 5 Jan 2016 17:03:45 +0100
From: Rabin Vincent <rabin@rab.in>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: davem@davemloft.net, netdev@vger.kernel.org, daniel@iogearbox.net,
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 linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org,
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Subject: Re: [PATCH] net: filter: make JITs zero A for SKF_AD_ALU_XOR_X
Message-ID: <20160105160345.GA3951@debian>
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On Tue, Jan 05, 2016 at 08:00:45AM -0800, Eric Dumazet wrote:
> On Tue, 2016-01-05 at 16:23 +0100, Rabin Vincent wrote:
> > The SKF_AD_ALU_XOR_X ancillary is not like the other ancillary data
> > instructions since it XORs A with X while all the others replace A with
> > some loaded value.  All the BPF JITs fail to clear A if this is used as
> > the first instruction in a filter.
> 
> Is x86_64 part of this 'All' subset ? ;)

No, because it's an eBPF JIT.