netdev - Re: [RFC PATCH 2/2] bpf: Initialise mod[] in bpf_trace

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Date:   Wed, 9 Aug 2017 08:39:27 +0100
From:   James Hogan <james.hogan@...tec.com>
To:     David Miller <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <ast@...nel.org>,
        <linux-kernel@...r.kernel.org>, <rostedt@...dmis.org>,
        <mingo@...hat.com>, <netdev@...r.kernel.org>
Subject: Re: [RFC PATCH 2/2] bpf: Initialise mod[] in bpf_trace_printk

On Tue, Aug 08, 2017 at 02:54:33PM -0700, David Miller wrote:
> From: James Hogan <james.hogan@...tec.com>
> Date: Tue, 08 Aug 2017 22:20:05 +0100
> 
> > cool, i hadn't realised unmentioned elements in an initialiser are
> > always zeroed, even when non-global/static, so had interpreted the
> > whole array as uninitialised. learn something new every day :-)
> > sorry for the noise.
> 
> You didn't have to know in the first place, you could have simply
> compiled the code into assembler by running:
> 
> 	make kernel/trace/bpf_trace.s
> 
> and seen for yourself before putting all of this time and effort into
> this patch and discussion.
> 
> If you don't know what the compiler does, simply look!

Well, thats the danger of wrongly thinking I already knew what it did in
this case. Anyway like I said, I'm sorry for the noise and wasting your
time (but please consider looking at the other patch which is certainly
a more real issue).

Thanks
James

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