From patchwork Wed Feb 26 13:03:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 1245055 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48SGHF4Lddz9sPR for ; Thu, 27 Feb 2020 00:04:57 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727308AbgBZNE5 convert rfc822-to-8bit (ORCPT ); Wed, 26 Feb 2020 08:04:57 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:30523 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726764AbgBZNE4 (ORCPT ); Wed, 26 Feb 2020 08:04:56 -0500 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-342-haPgIOFzO9ugDYp7qQJWDA-1; Wed, 26 Feb 2020 08:04:52 -0500 X-MC-Unique: haPgIOFzO9ugDYp7qQJWDA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5C4E8800D5F; Wed, 26 Feb 2020 13:04:50 +0000 (UTC) Received: from krava.redhat.com (unknown [10.43.17.9]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0CB8819C7F; Wed, 26 Feb 2020 13:04:44 +0000 (UTC) From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann Cc: Andrii Nakryiko , netdev@vger.kernel.org, bpf@vger.kernel.org, Yonghong Song , Song Liu , Martin KaFai Lau , Jakub Kicinski , David Miller , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , John Fastabend , Jesper Dangaard Brouer , Arnaldo Carvalho de Melo Subject: [PATCH 13/18] bpf: Return error value in bpf_dispatcher_update Date: Wed, 26 Feb 2020 14:03:40 +0100 Message-Id: <20200226130345.209469-14-jolsa@kernel.org> In-Reply-To: <20200226130345.209469-1-jolsa@kernel.org> References: <20200226130345.209469-1-jolsa@kernel.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kernel.org Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org We don't currently propagate error value from bpf_dispatcher_update function. This will be needed in following patch, that needs to update kallsyms based on the success of dispatcher update. Suggested-by: Andrii Nakryiko Signed-off-by: Jiri Olsa Acked-by: Song Liu --- kernel/bpf/dispatcher.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/dispatcher.c b/kernel/bpf/dispatcher.c index b3e5b214fed8..3a5871bbd6d0 100644 --- a/kernel/bpf/dispatcher.c +++ b/kernel/bpf/dispatcher.c @@ -102,7 +102,7 @@ static int bpf_dispatcher_prepare(struct bpf_dispatcher *d, void *image) return arch_prepare_bpf_dispatcher(image, &ips[0], d->num_progs); } -static void bpf_dispatcher_update(struct bpf_dispatcher *d, int prev_num_progs) +static int bpf_dispatcher_update(struct bpf_dispatcher *d, int prev_num_progs) { void *old, *new; u32 noff; @@ -118,15 +118,17 @@ static void bpf_dispatcher_update(struct bpf_dispatcher *d, int prev_num_progs) new = d->num_progs ? d->image + noff : NULL; if (new) { - if (bpf_dispatcher_prepare(d, new)) - return; + err = bpf_dispatcher_prepare(d, new); + if (err) + return err; } err = bpf_arch_text_poke(d->func, BPF_MOD_JUMP, old, new); if (err || !new) - return; + return err; d->image_off = noff; + return 0; } void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,