linux-kernel - Re: [RFC PATCH v4 09/29] bpf tools: Collect version and license from ELF sections

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Message-ID: <20150528055104.GA21006@Alexeis-MBP.westell.com>
Date:	Wed, 27 May 2015 22:51:21 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	paulus@...ba.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	acme@...nel.org, namhyung@...nel.org, jolsa@...nel.org,
	dsahern@...il.com, daniel@...earbox.net, brendan.d.gregg@...il.com,
	masami.hiramatsu.pt@...achi.com, lizefan@...wei.com,
	linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH v4 09/29] bpf tools: Collect version and license from
 ELF sections

On Thu, May 28, 2015 at 11:34:37AM +0800, Wangnan (F) wrote:
> >...
> >>+static int
> >>+bpf_object__init_kversion(struct bpf_object *obj,
> >>+			  void *data, size_t size)
> >>+{
> >>+	u32 kver;
> >>+	if (size < sizeof(kver)) {
> >shouldn't it be '!=' ?
> 
> Is it possible that LLVM pads 'version' section so the size of it becomes
> longer than sizeof(u32)?

llvm will not be padding a section unless user asks for it.
Try objdump on *_kern.o

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