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SubjectRe: [PATCH v2 08/10] scripts: Coccinelle script for namespace dependencies.


On Tue, 13 Aug 2019, Matthias Maennich wrote:

> A script that uses the '<module>.ns_deps' file generated by modpost to
> automatically add the required symbol namespace dependencies to each
> module.
>
> Usage:
> 1) Move some symbols to a namespace with EXPORT_SYMBOL_NS() or define
> DEFAULT_SYMBOL_NAMESPACE
> 2) Run 'make' (or 'make modules') and get warnings about modules not
> importing that namespace.
> 3) Run 'make nsdeps' to automatically add required import statements
> to said modules.
>
> This makes it easer for subsystem maintainers to introduce and maintain
> symbol namespaces into their codebase.
>
> Co-developed-by: Martijn Coenen <maco@android.com>
> Signed-off-by: Martijn Coenen <maco@android.com>
> Signed-off-by: Matthias Maennich <maennich@google.com>

Acked-by: Julia Lawall <julia.lawall@lip6.fr>


> ---
> MAINTAINERS | 5 ++
> Makefile | 12 +++++
> scripts/Makefile.modpost | 4 +-
> scripts/coccinelle/misc/add_namespace.cocci | 23 +++++++++
> scripts/nsdeps | 54 +++++++++++++++++++++
> 5 files changed, 97 insertions(+), 1 deletion(-)
> create mode 100644 scripts/coccinelle/misc/add_namespace.cocci
> create mode 100644 scripts/nsdeps
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e81e60bd7c26..aa169070a052 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11414,6 +11414,11 @@ S: Maintained
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/wtarreau/nolibc.git
> F: tools/include/nolibc/
>
> +NSDEPS
> +M: Matthias Maennich <maennich@google.com>
> +S: Maintained
> +F: scripts/nsdeps
> +
> NTB AMD DRIVER
> M: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> L: linux-ntb@googlegroups.com
> diff --git a/Makefile b/Makefile
> index 1b23f95db176..c5c3356e133c 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1500,6 +1500,9 @@ help:
> @echo ' headerdep - Detect inclusion cycles in headers'
> @echo ' coccicheck - Check with Coccinelle'
> @echo ''
> + @echo 'Tools:'
> + @echo ' nsdeps - Generate missing symbol namespace dependencies'
> + @echo ''
> @echo 'Kernel selftest:'
> @echo ' kselftest - Build and run kernel selftest (run as root)'
> @echo ' Build, install, and boot kernel before'
> @@ -1687,6 +1690,15 @@ quiet_cmd_tags = GEN $@
> tags TAGS cscope gtags: FORCE
> $(call cmd,tags)
>
> +# Script to generate missing namespace dependencies
> +# ---------------------------------------------------------------------------
> +
> +PHONY += nsdeps
> +
> +nsdeps:
> + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
> + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
> +
> # Scripts to check various things for consistency
> # ---------------------------------------------------------------------------
>
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> index 26e6574ecd08..743fe3a2e885 100644
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -56,7 +56,8 @@ MODPOST = scripts/mod/modpost \
> $(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \
> $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
> $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
> - $(if $(KBUILD_MODPOST_WARN),-w)
> + $(if $(KBUILD_MODPOST_WARN),-w) \
> + $(if $(filter nsdeps,$(MAKECMDGOALS)),-d)
>
> ifdef MODPOST_VMLINUX
>
> @@ -134,6 +135,7 @@ $(modules): %.ko :%.o %.mod.o FORCE
>
> targets += $(modules)
>
> +nsdeps: __modpost
>
> # Add FORCE to the prequisites of a target to force it to be always rebuilt.
> # ---------------------------------------------------------------------------
> diff --git a/scripts/coccinelle/misc/add_namespace.cocci b/scripts/coccinelle/misc/add_namespace.cocci
> new file mode 100644
> index 000000000000..c832bb6445a8
> --- /dev/null
> +++ b/scripts/coccinelle/misc/add_namespace.cocci
> @@ -0,0 +1,23 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +/// Adds missing MODULE_IMPORT_NS statements to source files
> +///
> +/// This script is usually called from scripts/nsdeps with -D ns=<namespace> to
> +/// add a missing namespace tag to a module source file.
> +///
> +
> +@has_ns_import@
> +declarer name MODULE_IMPORT_NS;
> +identifier virtual.ns;
> +@@
> +MODULE_IMPORT_NS(ns);
> +
> +// Add missing imports, but only adjacent to a MODULE_LICENSE statement.
> +// That ensures we are adding it only to the main module source file.
> +@do_import depends on !has_ns_import@
> +declarer name MODULE_LICENSE;
> +expression license;
> +identifier virtual.ns;
> +@@
> +MODULE_LICENSE(license);
> ++ MODULE_IMPORT_NS(ns);
> diff --git a/scripts/nsdeps b/scripts/nsdeps
> new file mode 100644
> index 000000000000..148db65a830f
> --- /dev/null
> +++ b/scripts/nsdeps
> @@ -0,0 +1,54 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Linux kernel symbol namespace import generator
> +#
> +# This script requires at least spatch
> +# version 1.0.4.
> +SPATCH_REQ_VERSION="1.0.4"
> +
> +DIR="$(dirname $(readlink -f $0))/.."
> +SPATCH="`which ${SPATCH:=spatch}`"
> +if [ ! -x "$SPATCH" ]; then
> + echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/'
> + exit 1
> +fi
> +
> +SPATCH_REQ_VERSION_NUM=$(echo $SPATCH_REQ_VERSION | ${DIR}/scripts/ld-version.sh)
> +SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')
> +SPATCH_VERSION_NUM=$(echo $SPATCH_VERSION | ${DIR}/scripts/ld-version.sh)
> +
> +if [ "$SPATCH_VERSION_NUM" -lt "$SPATCH_REQ_VERSION_NUM" ] ; then
> + echo 'spatch needs to be version 1.06 or higher'
> + exit 1
> +fi
> +
> +generate_deps_for_ns() {
> + $SPATCH --very-quiet --in-place --sp-file \
> + $srctree/scripts/coccinelle/misc/add_namespace.cocci -D ns=$1 $2
> +}
> +
> +generate_deps() {
> + local mod_file=`echo $@ | sed -e 's/\.ns_deps/\.mod/'`
> + local mod_name=`cat $mod_file | sed -n 1p | sed -e 's/\/[^.]*$//'`
> + local mod_source_files=`cat $mod_file | sed -n 2p | sed -e 's/\.o/\.c/g'`
> + for ns in `cat $@`; do
> + echo "Adding namespace $ns to module $mod_name (if needed)."
> + generate_deps_for_ns $ns $mod_source_files
> + # sort the imports
> + for source_file in $mod_source_files; do
> + sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp
> + offset=$(wc -l ${source_file}.tmp | awk '{print $1;}')
> + cat $source_file | grep MODULE_IMPORT_NS | sort -u >> ${source_file}.tmp
> + tail -n +$((offset +1)) ${source_file} | grep -v MODULE_IMPORT_NS >> ${source_file}.tmp
> + if ! diff -q ${source_file} ${source_file}.tmp; then
> + mv ${source_file}.tmp ${source_file}
> + else
> + rm ${source_file}.tmp
> + fi
> + done
> + done
> +}
> +
> +for f in `find $srctree/.tmp_versions/ -name *.ns_deps`; do
> + generate_deps $f
> +done
> --
> 2.23.0.rc1.153.gdeed80330f-goog
>
>

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