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Date: Wed, 27 May 2015 18:44:33 -0700
From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Wang Nan <wangnan0@huawei.com>
Cc: paulus@samba.org, a.p.zijlstra@chello.nl, mingo@redhat.com,
        acme@kernel.org, namhyung@kernel.org, jolsa@kernel.org,
        dsahern@gmail.com, daniel@iogearbox.net, brendan.d.gregg@gmail.com,
        masami.hiramatsu.pt@hitachi.com, lizefan@huawei.com,
        linux-kernel@vger.kernel.org, pi3orama@163.com
Subject: Re: [RFC PATCH v4 06/29] bpf tools: Open eBPF object file and do
 basic validation
Message-ID: <20150528014432.GA20764@Alexeis-MacBook-Pro.local>
References: <1432704004-171454-1-git-send-email-wangnan0@huawei.com>
 <1432704004-171454-7-git-send-email-wangnan0@huawei.com>
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On Wed, May 27, 2015 at 05:19:41AM +0000, Wang Nan wrote:
> This patch defines basic interface of libbpf. 'struct bpf_object' will
> be the handler of each object file. Its internal structure is hide to
> user. eBPF object files are compiled by LLVM as ELF format. In this
> patch, libelf is used to open those files, read EHDR and do basic
> validation according to e_type and e_machine.
> 
> All elf related staffs are grouped together and reside in efile field of
> 'struct bpf_object'. bpf_object__elf_finish() is introduced to clear it.
> 
> After all eBPF programs in an object file are loaded, related ELF
> information is useless. Close the object file and free those memory.
> 
> zfree() and zclose() are introduced to ensure setting NULL pointers and
> negative file descriptors after resources are released.
> 
> Signed-off-by: Wang Nan <wangnan0@huawei.com>

the __ notation actually looks good in this context.
Acked-by: Alexei Starovoitov <ast@plumgrid.com>

btw, you didn't cc me on this set, luckily I found it on lkml.