On 5/9/25 4:17 PM, Josh Poimboeuf wrote:
> Add a klp-build script which automates the generation of a livepatch
> module from a source .patch file by performing the following steps:
>
> - Builds an original kernel with -function-sections and
> -fdata-sections, plus objtool function checksumming.
>
> - Applies the .patch file and rebuilds the kernel using the same
> options.
>
> - Runs 'objtool klp diff' to detect changed functions and generate
> intermediate binary diff objects.
>
> - Builds a kernel module which links the diff objects with some
> livepatch module init code (scripts/livepatch/init.c).
>
> - Finalizes the livepatch module (aka work around linker wreckage)
> using 'objtool klp post-link'.
>
> Signed-off-by: Josh Poimboeuf <jpoim...@kernel.org>
> ---
> scripts/livepatch/klp-build | 697 ++++++++++++++++++++++++++++++++++++
> ...
> +get_patch_files() {
> + local patch="$1"
> +
> + grep0 -E '^(--- |\+\+\+ )' "$patch" \
> + | gawk '{print $2}' \
If we split the rest of this line on the tab character and print the
first part of $2:
gawk '{ split($2, a, "\t"); print a[1] }'
then it can additionally handle patches generated by `diff -Nupr` with a
timepstamp ("--- <filepath>\t<timestamp>").
> +# Refresh the patch hunk headers, specifically the line numbers and counts.
> +refresh_patch() {
> + local patch="$1"
> + local tmpdir="$PATCH_TMP_DIR"
> + local files=()
> +
> + rm -rf "$tmpdir"
> + mkdir -p "$tmpdir/a"
> + mkdir -p "$tmpdir/b"
> +
> + # Find all source files affected by the patch
> + grep0 -E '^(--- |\+\+\+ )[^ /]+' "$patch" |
> + sed -E 's/(--- |\+\+\+ )[^ /]+\///' |
> + sort | uniq | mapfile -t files
> +
Should just call `get_patch_files() here?
--
Joe
