From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752737AbcKZRMb (ORCPT ); Sat, 26 Nov 2016 12:12:31 -0500 Received: from mail-pf0-f196.google.com ([209.85.192.196]:35012 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751721AbcKZRMY (ORCPT ); Sat, 26 Nov 2016 12:12:24 -0500 Date: Sat, 26 Nov 2016 09:12:19 -0800 From: Alexei Starovoitov To: Wang Nan Cc: acme@redhat.com, ast@fb.com, lizefan@huawei.com, hekuang@huawei.com, linux-kernel@vger.kernel.org, pi3orama@163.com, joe@ovn.org, Alexei Starovoitov , Jiri Olsa Subject: Re: [PATCH v3 03/30] tools lib bpf: Retrive bpf_map through offset of bpf_map_def Message-ID: <20161126171217.GD83987@ast-mbp.thefacebook.com> References: <20161126070354.141764-1-wangnan0@huawei.com> <20161126070354.141764-4-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161126070354.141764-4-wangnan0@huawei.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Nov 26, 2016 at 07:03:27AM +0000, Wang Nan wrote: > Add a new API to libbpf, caller is able to get bpf_map through the > offset of bpf_map_def to 'maps' section. > > The API will be used to help jitted perf hook code find fd of a map. > > Signed-off-by: Wang Nan ... > +struct bpf_map * > +bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset) > +{ > + int i; > + > + for (i = 0; i < obj->nr_maps; i++) { > + if (obj->maps[i].offset == offset) > + return &obj->maps[i]; > + } > + return ERR_PTR(-ENOENT); > +} Acked-by: Alexei Starovoitov