From patchwork Thu Oct 21 12:39:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pu Lehui X-Patchwork-Id: 12574893 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12819C433FE for ; Thu, 21 Oct 2021 12:37:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6503611CE for ; Thu, 21 Oct 2021 12:37:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231623AbhJUMjj (ORCPT ); Thu, 21 Oct 2021 08:39:39 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:25307 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230508AbhJUMji (ORCPT ); Thu, 21 Oct 2021 08:39:38 -0400 Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4HZn1n73CVzbglW; Thu, 21 Oct 2021 20:32:45 +0800 (CST) Received: from dggpemm500019.china.huawei.com (7.185.36.180) by dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.15; Thu, 21 Oct 2021 20:37:20 +0800 Received: from ubuntu1804.huawei.com (10.67.174.98) by dggpemm500019.china.huawei.com (7.185.36.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.15; Thu, 21 Oct 2021 20:37:20 +0800 From: Pu Lehui To: , , , , , , , , , CC: , , , , Subject: [PATCH bpf-next] samples: bpf: Suppress readelf stderr when probing for BTF support Date: Thu, 21 Oct 2021 20:39:13 +0800 Message-ID: <20211021123913.48833-1-pulehui@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.67.174.98] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500019.china.huawei.com (7.185.36.180) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net When compiling bpf samples, the following warning appears: readelf: Error: Missing knowledge of 32-bit reloc types used in DWARF sections of machine number 247 readelf: Warning: unable to apply unsupported reloc type 10 to section .debug_info readelf: Warning: unable to apply unsupported reloc type 1 to section .debug_info readelf: Warning: unable to apply unsupported reloc type 10 to section .debug_info Same problem was mentioned in commit 2f0921262ba9 ("selftests/bpf: suppress readelf stderr when probing for BTF support"), let's use readelf that supports btf. Signed-off-by: Pu Lehui Acked-by: John Fastabend Acked-by: Yonghong Song --- samples/bpf/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 2366242edb7c..a886dff1ba89 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -229,6 +229,7 @@ CLANG ?= clang OPT ?= opt LLVM_DIS ?= llvm-dis LLVM_OBJCOPY ?= llvm-objcopy +LLVM_READELF ?= llvm-readelf BTF_PAHOLE ?= pahole # Detect that we're cross compiling and use the cross compiler @@ -252,7 +253,7 @@ BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF) BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm') BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \ $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \ - readelf -S ./llvm_btf_verify.o | grep BTF; \ + $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \ /bin/rm -f ./llvm_btf_verify.o) BPF_EXTRA_CFLAGS += -fno-stack-protector