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Date: Mon, 18 May 2015 11:06:01 -0700
From: Alexei Starovoitov <ast@plumgrid.com>
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To: Wang Nan <wangnan0@huawei.com>, 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,
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CC: lizefan@huawei.com, linux-kernel@vger.kernel.org, pi3orama@163.com
Subject: Re: [RFC PATCH v3 09/37] bpf tools: Open eBPF object file and do
 basic validation
References: <1431860222-61636-1-git-send-email-wangnan0@huawei.com> <1431860222-61636-10-git-send-email-wangnan0@huawei.com>
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On 5/17/15 3:56 AM, Wang Nan wrote:
> This patch adds basic 'struct bpf_object' which will be used for eBPF
> object file loading. 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 elf field of
> 'struct bpf_object'. bpf_obj_clear_elf() is introduced to clear it.
>
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> ---
...
> +static void bpf_obj_clear_elf(struct bpf_object *obj)
> +{
> +	if (!obj_elf_valid(obj))
> +		return;
> +
> +	if (obj->elf.elf) {
> +		elf_end(obj->elf.elf);
> +		obj->elf.elf = NULL;

the name of the function is odd.
'..clear_elf' ? Only because the field was named 'elf' ?
Also obj->elf.elf looks unbalanced.

may be bpf_obj_elf_finish() to match bpf_obj_elf_init()
and obj->efile.elf ?

> +	}
> +	if (obj->elf.fd >= 0) {
> +		close(obj->elf.fd);

and the above will change to obj->efile.fd ?