From patchwork Tue Dec 26 14:33:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 13504901 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C2C81E487; Tue, 26 Dec 2023 14:34:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lrizIdsH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4BB4C433C8; Tue, 26 Dec 2023 14:34:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1703601245; bh=cMKdaJ1jcRx8KAs7hSbmNJKzZX2VPA0PcqyRXDg1p9Y=; h=From:To:Cc:Subject:Date:From; b=lrizIdsHXpZQgoGJsMF+pXPd5CqZny3N+eeIzElP0exefiIJS7Zg8d50K9Gip0YEI l/oKG84bscELItWYWQ1gsalxQf1b4VS/7emUhjMh72ABkEorkdQ4oUjfVszjIJfzaC U68lfvgTdQKY4GA5gplw/Lr3davBLzNcymzsZW5xFPccvwFFwiRcsl+iE/OMi/rbrL T00LZXf3ZJa2SjmmV7HA57zvrZuDge7gRasCp11fH8TLeUquX4dsRxua4FSvBzVdmP WRkk+9mdLCrDvqDsMV29+E1Z4xZo+OAb+UccFc/uCpL+j61RmkSbG0fe6kriCRWIcB dvs+x6aQVnHzw== From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: Ben Hutchings , Masahiro Yamada , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , linux-kernel@vger.kernel.org Subject: [PATCH] kbuild: deb-pkg: use build ID instead of debug link for dbg package Date: Tue, 26 Dec 2023 23:33:59 +0900 Message-Id: <20231226143359.1438995-1-masahiroy@kernel.org> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There are two ways of managing separate debug info files: [1] The executable contains the .gnu_debuglink section, which specifies the name and the CRC of the separate debug info file. [2] The executable contains a build ID, and the corresponding debug info file is placed in the .build-id directory. We could do both, but the former, which 'make deb-pkg' currently does, results in complicated installation steps because we need to manually strip the debug sections, create debug links, and re-sign the modules. Besides, it is not working with module compression. This commit abandons the approach [1], and instead opts for [2]. Debian kernel commit de26137e2a9f ("Drop not needed extra step to add debug links") also stopped adding debug links. Signed-off-by: Masahiro Yamada --- scripts/package/builddeb | 32 +++++++++++++------------------- 1 file changed, 13 insertions(+), 19 deletions(-) diff --git a/scripts/package/builddeb b/scripts/package/builddeb index 436d55a83ab0..cc8c7a807fcc 100755 --- a/scripts/package/builddeb +++ b/scripts/package/builddeb @@ -49,7 +49,7 @@ install_linux_image () { ${MAKE} -f ${srctree}/Makefile INSTALL_DTBS_PATH="${pdir}/usr/lib/linux-image-${KERNELRELEASE}" dtbs_install fi - ${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" modules_install + ${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" INSTALL_MOD_STRIP=1 modules_install rm -f "${pdir}/lib/modules/${KERNELRELEASE}/build" # Install the kernel @@ -110,25 +110,21 @@ install_linux_image () { install_linux_image_dbg () { pdir=$1 - image_pdir=$2 rm -rf ${pdir} - for module in $(find ${image_pdir}/lib/modules/ -name *.ko -printf '%P\n'); do - module=lib/modules/${module} - mkdir -p $(dirname ${pdir}/usr/lib/debug/${module}) - # only keep debug symbols in the debug file - ${OBJCOPY} --only-keep-debug ${image_pdir}/${module} ${pdir}/usr/lib/debug/${module} - # strip original module from debug symbols - ${OBJCOPY} --strip-debug ${image_pdir}/${module} - # then add a link to those - ${OBJCOPY} --add-gnu-debuglink=${pdir}/usr/lib/debug/${module} ${image_pdir}/${module} - done + # Parse modules.order directly because 'make modules_install' may sign, + # compress modules, and then run unneeded depmod. + while read -r mod; do + mod="${mod%.o}.ko" + dbg="${pdir}/usr/lib/debug/lib/modules/${KERNELRELEASE}/kernel/${mod}" + buildid=$("${READELF}" -n "${mod}" | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p') + link="${pdir}/usr/lib/debug/.build-id/${buildid}.debug" - # re-sign stripped modules - if is_enabled CONFIG_MODULE_SIG_ALL; then - ${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${image_pdir}" modules_sign - fi + mkdir -p "${dbg%/*}" "${link%/*}" + "${OBJCOPY}" --only-keep-debug "${mod}" "${dbg}" + ln -sf --relative "${dbg}" "${link}" + done < modules.order # Build debug package # Different tools want the image in different locations @@ -176,9 +172,7 @@ for package in ${packages_enabled} do case ${package} in *-dbg) - # This must be done after linux-image, that is, we expect the - # debug package appears after linux-image in debian/control. - install_linux_image_dbg debian/linux-image-dbg debian/linux-image;; + install_linux_image_dbg debian/linux-image-dbg;; linux-image-*|user-mode-linux-*) install_linux_image debian/linux-image ${package};; linux-libc-dev)