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https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable.git
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bbda5ec671
My main motivation of this commit is to clean up scripts/Kbuild.include and scripts/Makefile.build. Currently, CONFIG_TRIM_UNUSED_KSYMS works with a tricky gimmick; possibly exported symbols are detected by letting $(CPP) replace EXPORT_SYMBOL* with a special string '=== __KSYM_*===', which is post-processed by sed, and passed to fixdep. The extra preprocessing is costly, and hacking cmd_and_fixdep is ugly. I came up with a new way to find exported symbols; insert a dummy symbol __ksym_marker_* to each potentially exported symbol. Those dummy symbols are picked up by $(NM), post-processed by sed, then appended to .*.cmd files. I collected the post-process part to a new shell script scripts/gen_ksymdeps.sh for readability. The dummy symbols are put into the .discard.* section so that the linker script rips them off the final vmlinux or modules. A nice side-effect is building with CONFIG_TRIM_UNUSED_KSYMS will be much faster. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Nicolas Pitre <nico@linaro.org>
26 lines
399 B
Bash
Executable File
26 lines
399 B
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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set -e
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# List of exported symbols
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ksyms=$($NM $1 | sed -n 's/.*__ksym_marker_\(.*\)/\1/p' | tr A-Z a-z)
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if [ -z "$ksyms" ]; then
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exit 0
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fi
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echo
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echo "ksymdeps_$1 := \\"
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for s in $ksyms
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do
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echo $s | sed -e 's:^_*: $(wildcard include/ksym/:' \
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-e 's:__*:/:g' -e 's/$/.h) \\/'
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done
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echo
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echo "$1: \$(ksymdeps_$1)"
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echo
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echo "\$(ksymdeps_$1):"
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