From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B12FEC433E0 for ; Fri, 7 Aug 2020 17:26:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D8AA22C9F for ; Fri, 7 Aug 2020 17:26:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Cm3GBEGB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726058AbgHGR0B (ORCPT ); Fri, 7 Aug 2020 13:26:01 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:38729 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725900AbgHGR0A (ORCPT ); Fri, 7 Aug 2020 13:26:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1596821155; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=1OKvA0TNCXh+ztrd8AvHmGOv+UMmuzg53pWAJG5mrDk=; b=Cm3GBEGBiE007tJbP3IsHWTo9YIkLR6kw8fV1tr5+IcHmTpjEh6DuaBEACDOSGByrqgcQz 4ZgX24F/PgvyRkxHKpPEYheIYJ4quoixtoE8nLW0VeUdy5NnCk4wRv0gUNaLBGHOPJyj3k cO7DvoSah2WFcAyNLP9+7iLWqUPPIRI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-167-8eQRjAnaMeqj5qKSf_ezAQ-1; Fri, 07 Aug 2020 13:25:51 -0400 X-MC-Unique: 8eQRjAnaMeqj5qKSf_ezAQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 66803107BA68; Fri, 7 Aug 2020 17:25:49 +0000 (UTC) Received: from krava (unknown [10.40.193.136]) by smtp.corp.redhat.com (Postfix) with SMTP id A1B2D8AC13; Fri, 7 Aug 2020 17:25:44 +0000 (UTC) Date: Fri, 7 Aug 2020 19:25:43 +0200 From: Jiri Olsa To: Alexei Starovoitov Cc: Jiri Olsa , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , netdev@vger.kernel.org, bpf@vger.kernel.org, Song Liu , Yonghong Song , Martin KaFai Lau , David Miller , John Fastabend , Wenbo Zhang , KP Singh , Brendan Gregg , Florent Revest , Al Viro Subject: Re: [PATCH v10 bpf-next 00/14] bpf: Add d_path helper Message-ID: <20200807172543.GB561444@krava> References: <20200807094559.571260-1-jolsa@kernel.org> <20200807163503.ytoej6qxsjuedty7@ast-mbp.dhcp.thefacebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200807163503.ytoej6qxsjuedty7@ast-mbp.dhcp.thefacebook.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Fri, Aug 07, 2020 at 09:35:03AM -0700, Alexei Starovoitov wrote: > On Fri, Aug 07, 2020 at 11:45:45AM +0200, Jiri Olsa wrote: > > hi, > > adding d_path helper function that returns full path for > > given 'struct path' object, which needs to be the kernel > > BTF 'path' object. The path is returned in buffer provided > > 'buf' of size 'sz' and is zero terminated. > > > > long bpf_d_path(struct path *path, char *buf, u32 sz); > > > > The helper calls directly d_path function, so there's only > > limited set of function it can be called from. > > > > The patchset also adds support to add set of BTF IDs for > > a helper to define functions that the helper is allowed > > to be called from. > > > > Also available at: > > https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git > > bpf/d_path > > > > v10 changes: > > - added few acks > > - returned long instead of int in bpf_d_path helper [Alexei] > > - used local cnt variable in d_path test [Andrii] > > - fixed tyo in d_path comment [Andrii] > > - get rid of reg->off condition in check_func_arg [Andrii] > > bpf-next is closed. > I still encourage developers to submit new features for review, but please tag > them as RFC, so the purpose is clear to both maintainers and authors. sry, did not know this was the rule jirka