From patchwork Mon Jan 11 18:06:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 12011359 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 294C6C43331 for ; Mon, 11 Jan 2021 18:07:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11202225AB for ; Mon, 11 Jan 2021 18:07:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390110AbhAKSHc (ORCPT ); Mon, 11 Jan 2021 13:07:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390106AbhAKSHb (ORCPT ); Mon, 11 Jan 2021 13:07:31 -0500 Received: from mail-qk1-x734.google.com (mail-qk1-x734.google.com [IPv6:2607:f8b0:4864:20::734]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2AC36C0617AB; Mon, 11 Jan 2021 10:06:32 -0800 (PST) Received: by mail-qk1-x734.google.com with SMTP id w79so326123qkb.5; Mon, 11 Jan 2021 10:06:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=9lp28zoWOKLPGFRTu8+kIhpE6rBiQRtmpdJvXYx3+tY=; b=ez1SefshWrFxr/3XbQrkWZhJIOzAqVAKha8CL5HWT4x+mLivWRS4dkFUm7HwH2jRFj 35RyeXAQJ1GHXy0yh6vjr2sd1FmADkpsLwXV73Eqx0FTfyI91aVGSqsGWrpB9hd9Z3Mg 5ezoFNrH++EteGshvlRBQEMzZx+t77f48oPDqewSK7fGTUaO1+wWYAP1lq2kt+bn1Lo7 yPIll/9SFKumsFKeGZqH0lHOfeaAkKP6HS5T6doHT5QxygwFwC7rcCi24LCEs+p+bCWm ZwBI0MYIGO+4Ti1un1JlgNvYPrrv0JSyPZwmh/nGNhlvBRp/HWBHY90zCUJJ8OpSDcep tUnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=9lp28zoWOKLPGFRTu8+kIhpE6rBiQRtmpdJvXYx3+tY=; b=nyycVbVBFCA5cHX1K+1kZnz0C8sNAy+zEDr/+r0gwk4Z4bb3CNbRUaOCeNnALPFjDN sL3Gldu4LguphJk61D25g4VCuGhKrUpPqWA/WW0qvn5ro7WKC2a81GQZsavlHGmE3ZaC kv/kHjtCuOjODWrZJL0xoEWJd8VbG82kR/tFTna7G0kd9EQkuoFBKWBDi0O2bX7nGbpA Z+e/VYX0bxoFbWUsO5bAAmKUWGbiXT79Orld+rHngvys+hUI+b+kCW0ON2tq2KsrmEeD EhqDrqpNypsg810lbjNw+KpkF1ryDENlFGxlriMfvviJKaQ/EvrjHK2Z5l7a+GObNENH 1leQ== X-Gm-Message-State: AOAM5332ukz/6db0jEN5Tx7GdduoONZatvOQX3DnvZVmh/aykDipLygz 21Feg/00s6A3mBmyrbK7tB+p4Yg9vI2Cgg== X-Google-Smtp-Source: ABdhPJwx8k0tYOOZKUoXq0vInH3wbViiSZCtXbNbqNuIHyl1UktVYK4JCeL9x3IbIOGZ87AlhyDxtg== X-Received: by 2002:a37:b94:: with SMTP id 142mr536071qkl.318.1610388391183; Mon, 11 Jan 2021 10:06:31 -0800 (PST) Received: from localhost.localdomain ([2604:1380:45f1:1d00::1]) by smtp.gmail.com with ESMTPSA id g28sm158752qtm.91.2021.01.11.10.06.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Jan 2021 10:06:30 -0800 (PST) From: Nathan Chancellor To: Masahiro Yamada , Michal Marek , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, Nathan Chancellor , Sedat Dilek Subject: [PATCH] bpf: Hoise pahole version checks into Kconfig Date: Mon, 11 Jan 2021 11:06:09 -0700 Message-Id: <20210111180609.713998-1-natechancellor@gmail.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 X-Patchwork-Bot: notify Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org After commit da5fb18225b4 ("bpf: Support pre-2.25-binutils objcopy for vmlinux BTF"), having CONFIG_DEBUG_INFO_BTF enabled but lacking a valid copy of pahole results in a kernel that will fully compile but fail to link. The user then has to either install pahole or disable CONFIG_DEBUG_INFO_BTF and rebuild the kernel but only after their build has failed, which could have been a significant amount of time depending on the hardware. Avoid a poor user experience and require pahole to be installed with an appropriate version to select and use CONFIG_DEBUG_INFO_BTF, which is standard for options that require a specific tools version. Suggested-by: Sedat Dilek Signed-off-by: Nathan Chancellor Tested-by: Sedat Dilek --- MAINTAINERS | 1 + init/Kconfig | 4 ++++ lib/Kconfig.debug | 6 ++---- scripts/link-vmlinux.sh | 13 ------------- scripts/pahole-version.sh | 16 ++++++++++++++++ 5 files changed, 23 insertions(+), 17 deletions(-) create mode 100755 scripts/pahole-version.sh base-commit: e22d7f05e445165e58feddb4e40cc9c0f94453bc diff --git a/MAINTAINERS b/MAINTAINERS index b8db7637263a..6f6e24285a94 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3282,6 +3282,7 @@ F: net/core/filter.c F: net/sched/act_bpf.c F: net/sched/cls_bpf.c F: samples/bpf/ +F: scripts/pahole-version.sh F: tools/bpf/ F: tools/lib/bpf/ F: tools/testing/selftests/bpf/ diff --git a/init/Kconfig b/init/Kconfig index b77c60f8b963..872c61b5d204 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -74,6 +74,10 @@ config TOOLS_SUPPORT_RELR config CC_HAS_ASM_INLINE def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null) +config PAHOLE_VERSION + int + default $(shell,$(srctree)/scripts/pahole-version.sh $(PAHOLE)) + config CONSTRUCTORS bool depends on !UML diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 7937265ef879..70c446af9664 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -267,6 +267,7 @@ config DEBUG_INFO_DWARF4 config DEBUG_INFO_BTF bool "Generate BTF typeinfo" + depends on PAHOLE_VERSION >= 116 depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST help @@ -274,12 +275,9 @@ config DEBUG_INFO_BTF Turning this on expects presence of pahole tool, which will convert DWARF type info into equivalent deduplicated BTF type info. -config PAHOLE_HAS_SPLIT_BTF - def_bool $(success, test `$(PAHOLE) --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/'` -ge "119") - config DEBUG_INFO_BTF_MODULES def_bool y - depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF + depends on DEBUG_INFO_BTF && MODULES && PAHOLE_VERSION >= 119 help Generate compact split BTF type information for kernel modules. diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 6eded325c837..eef40fa9485d 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -139,19 +139,6 @@ vmlinux_link() # ${2} - file to dump raw BTF data into gen_btf() { - local pahole_ver - - if ! [ -x "$(command -v ${PAHOLE})" ]; then - echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" - return 1 - fi - - pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/') - if [ "${pahole_ver}" -lt "116" ]; then - echo >&2 "BTF: ${1}: pahole version $(${PAHOLE} --version) is too old, need at least v1.16" - return 1 - fi - vmlinux_link ${1} info "BTF" ${2} diff --git a/scripts/pahole-version.sh b/scripts/pahole-version.sh new file mode 100755 index 000000000000..6de6f734a345 --- /dev/null +++ b/scripts/pahole-version.sh @@ -0,0 +1,16 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# +# Usage: $ ./scripts/pahole-version.sh pahole +# +# Print the pahole version as a three digit string +# such as `119' for pahole v1.19 etc. + +pahole="$*" + +if ! [ -x "$(command -v $pahole)" ]; then + echo 0 + exit 1 +fi + +$pahole --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/'