Hi.
On Tue, Feb 18, 2020 at 6:41 PM Quentin Perret <qperret@xxxxxxxxxx> 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.
>
> Acked-by: Nicolas Pitre <nico@xxxxxxxxxxx>
> Tested-by: Matthias Maennich <maennich@xxxxxxxxxx>
> Reviewed-by: Matthias Maennich <maennich@xxxxxxxxxx>
> Signed-off-by: Quentin Perret <qperret@xxxxxxxxxx>
> ---
> scripts/adjust_autoksyms.sh | 36 +++-----------------------
> scripts/gen_autoksyms.sh | 51 +++++++++++++++++++++++++++++++++++++
> 2 files changed, 55 insertions(+), 32 deletions(-)
> create mode 100755 scripts/gen_autoksyms.sh
>
> diff --git a/scripts/adjust_autoksyms.sh b/scripts/adjust_autoksyms.sh
> index ff46996525d3..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
> @@ -38,35 +37,8 @@ esac
> # We need access to CONFIG_ symbols
> . include/config/auto.conf
>
> -ksym_wl=/dev/null
> -if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
> - # Use 'eval' to expand the whitelist path and check if it is relative
> - eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
> - [ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
> - if [ ! -f "$ksym_wl" ]; then
Just a Nit.
Maybe, is testing -r better ?
'cat - "$ksym_wl"' is piped, so its error code is not checked.
So, checking the read permission here is robust, I think.
> - echo "ERROR: '$ksym_wl' whitelist file not found" >&2
> - exit 1
> - fi
> -fi
> -
> -# Generate a new ksym list file with symbols needed by the current
> -# set of modules.
> -cat > "$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..6c625f52118f
> --- /dev/null
> +++ b/scripts/gen_autoksyms.sh
> @@ -0,0 +1,51 @@
> +#!/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
> +
> +ksym_wl=/dev/null
> +if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
> + # Use 'eval' to expand the whitelist path and check if it is relative
> + eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
> + [ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
> + if [ ! -f "$ksym_wl" ]; then
> + echo "ERROR: '$ksym_wl' whitelist file not found" >&2
> + exit 1
> + fi
> +fi
> +
> +# 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
> --
> 2.25.0.265.gbab2e86ba0-goog
>
--
Best Regards
Masahiro Yamada
