diff options
| -rw-r--r-- | init/Kconfig | 13 | ||||
| -rwxr-xr-x | scripts/adjust_autoksyms.sh | 12 |
2 files changed, 25 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 240c1ed15c69..9f2f10cfb097 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -2207,6 +2207,19 @@ config TRIM_UNUSED_KSYMS If unsure, or if you need to build out-of-tree modules, say N. +config UNUSED_KSYMS_WHITELIST + string "Whitelist of symbols to keep in ksymtab" + depends on TRIM_UNUSED_KSYMS + help + By default, all unused exported symbols will be un-exported from the + build when TRIM_UNUSED_KSYMS is selected. + + UNUSED_KSYMS_WHITELIST allows to whitelist symbols that must be kept + exported at all times, even in absence of in-tree users. The value to + set here is the path to a text file containing the list of symbols, + one per line. The path can be absolute, or relative to the kernel + source tree. + endif # MODULES config MODULES_TREE_LOOKUP diff --git a/scripts/adjust_autoksyms.sh b/scripts/adjust_autoksyms.sh index a904bf1f5e67..212ba45595d3 100755 --- a/scripts/adjust_autoksyms.sh +++ b/scripts/adjust_autoksyms.sh @@ -38,6 +38,17 @@ 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 "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then + echo "ERROR: '$ksym_wl' whitelist file not found" >&2 + exit 1 + fi +fi + # Generate a new ksym list file with symbols needed by the current # set of modules. cat > "$new_ksyms_file" << EOT @@ -48,6 +59,7 @@ cat > "$new_ksyms_file" << EOT EOT sed 's/ko$/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" |