Re: [PATCH v4 2/3] kbuild: split adjust_autoksyms.sh in two parts

[Matthias Maennich]

On Wed, Feb 12, 2020 at 08:21:39PM +0000, Quentin Perret wrote:
> In order to prepare the ground for a build-time optimization, split
> adjust_autoksyms.sh into two scripts: one that generates autoksyms.h
> based on all currently available information (whitelist, and .mod
> files), and the other to inspect the diff between two versions of
> autoksyms.h and trigger appropriate rebuilds.
>
> Signed-off-by: Quentin Perret <qperret@xxxxxxxxxx>

Reviewed-by: Matthias Maennich <maennich@xxxxxxxxxx>
Tested-by: Matthias Maennich <maennich@xxxxxxxxxx>

Cheers,
Matthias

> ---
> scripts/adjust_autoksyms.sh | 29 ++++--------------------
> scripts/gen_autoksyms.sh    | 44 +++++++++++++++++++++++++++++++++++++
> 2 files changed, 48 insertions(+), 25 deletions(-)
> create mode 100755 scripts/gen_autoksyms.sh
>
> diff --git a/scripts/adjust_autoksyms.sh b/scripts/adjust_autoksyms.sh
> index 93f4d10e66e6..2b366d945ccb 100755
> --- a/scripts/adjust_autoksyms.sh
> +++ b/scripts/adjust_autoksyms.sh
> @@ -1,14 +1,13 @@
> #!/bin/sh
> # SPDX-License-Identifier: GPL-2.0-only
>
> -# Script to create/update include/generated/autoksyms.h and dependency files
> +# Script to update include/generated/autoksyms.h and dependency files
> #
> # Copyright:	(C) 2016  Linaro Limited
> # Created by:	Nicolas Pitre, January 2016
> #
>
> -# Create/update the include/generated/autoksyms.h file from the list
> -# of all module's needed symbols as recorded on the second line of *.mod files.
> +# Update the include/generated/autoksyms.h file.
> #
> # For each symbol being added or removed, the corresponding dependency
> # file's timestamp is updated to force a rebuild of the affected source
> @@ -38,28 +37,8 @@ esac
> # We need access to CONFIG_ symbols
> . include/config/auto.conf
>
> -# Use 'eval' to expand the whitelist path and check if it is relative
> -eval ksym_wl="${CONFIG_UNUSED_KSYMS_WHITELIST:-/dev/null}"
> -[ "${ksym_wl:0:1}" = "/" ] || ksym_wl="$abs_srctree/$ksym_wl"
> -
> -# Generate a new ksym list file with symbols needed by the current
> -# set of modules.
> -cat > "$new_ksyms_file" << EOT
> -/*
> - * Automatically generated file; DO NOT EDIT.
> - */
> -
> -EOT
> -sed 's/ko$/mod/' modules.order |
> -xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
> -cat - "$ksym_wl" |
> -sort -u |
> -sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file"
> -
> -# Special case for modversions (see modpost.c)
> -if [ -n "$CONFIG_MODVERSIONS" ]; then
> -	echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
> -fi
> +# Generate a new symbol list file
> +$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file"
>
> # Extract changes between old and new list and touch corresponding
> # dependency files.
> diff --git a/scripts/gen_autoksyms.sh b/scripts/gen_autoksyms.sh
> new file mode 100755
> index 000000000000..2cea433616a8
> --- /dev/null
> +++ b/scripts/gen_autoksyms.sh
> @@ -0,0 +1,44 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +# Create an autoksyms.h header file from the list of all module's needed symbols
> +# as recorded on the second line of *.mod files and the user-provided symbol
> +# whitelist.
> +
> +set -e
> +
> +output_file="$1"
> +
> +# Use "make V=1" to debug this script.
> +case "$KBUILD_VERBOSE" in
> +*1*)
> +	set -x
> +	;;
> +esac
> +
> +# We need access to CONFIG_ symbols
> +. include/config/auto.conf
> +
> +# Use 'eval' to expand the whitelist path and check if it is relative
> +eval ksym_wl="${CONFIG_UNUSED_KSYMS_WHITELIST:-/dev/null}"
> +[ "${ksym_wl:0:1}" = "/" ] || ksym_wl="$abs_srctree/$ksym_wl"
> +
> +# Generate a new ksym list file with symbols needed by the current
> +# set of modules.
> +cat > "$output_file" << EOT
> +/*
> + * Automatically generated file; DO NOT EDIT.
> + */
> +
> +EOT
> +
> +sed 's/ko$/mod/' modules.order |
> +xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
> +cat - "$ksym_wl" |
> +sort -u |
> +sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
> +
> +# Special case for modversions (see modpost.c)
> +if [ -n "$CONFIG_MODVERSIONS" ]; then
> +	echo "#define __KSYM_module_layout 1" >> "$output_file"
> +fi
> --
> 2.25.0.225.g125e21ebc7-goog