mirror of https://github.com/dynup/kpatch
kpatch-build: support Linux 5.19 .cmd file format
Rewrite kobj_find() to deal with Linux 5.19, where the .cmd files use object file paths relative to the .cmd file rather than relative to the root of the kernel tree. While at it, add several performance enhancements to prevent all currently known deep finds. This is all quite fiddly. But it works. Fixes #1277. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Josh Poimboeuf
parent
7861240f48
commit
1d7e8a74bb
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@ -434,82 +434,215 @@ find_special_section_data() {
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return
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}
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filter_parent_obj()
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{
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local dir="${1}"
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local file="${2}"
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# path of file, relative to dir
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# adapted from https://stackoverflow.com/a/24848739
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relpath() {
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local file="$1"
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local dir="$2"
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grep -v "\.mod\.cmd$" | grep -Fv "${dir}/.${file}.cmd"
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local filedir
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local common
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local result
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filedir="$(dirname "$(readlink -f "$file")")"
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common="$(readlink -f "$dir")"
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if [[ "$filedir" = "$common" ]]; then
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basename "$file"
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return
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fi
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while [[ "${filedir#$common/}" = "$filedir" ]]; do
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common="$(dirname "$common")"
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result="../$result"
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done
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result="${result}${filedir#$common/}"
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echo "${result}/$(basename "$file")"
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}
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cmd_file_to_o_file() {
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local parent="$1"
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# convert cmd file name to corresponding .o
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parent_dir="$(dirname "$parent")"
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parent_dir="${parent_dir#./}"
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parent="$(basename "$parent")"
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parent="${parent#.}"
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parent="${parent%.cmd}"
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parent="$parent_dir/$parent"
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[[ -f $parent ]] || die "can't find $parent associated with $1"
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echo "$parent"
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}
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get_parent_from_parents() {
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local parents=("$@")
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[[ ${#parents[@]} -eq 0 ]] && PARENT="" && return
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[[ ${#parents[@]} -eq 1 ]] && PARENT="${parents[0]}" && return
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# multiple parents:
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local parent
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local mod_name="${parents[0]%.*}"
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local mod_file
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for parent in "${parents[@]}"; do
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# for modules, there can be multiple matches. Some
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# combination of foo.o, foo.mod, and foo.ko, depending
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# on kernel version and whether the module is single or
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# multi-object. Make sure a .mod and/or .ko exists, and no
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# more than one .mod/.ko exists.
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[[ $parent = *.o ]] && continue
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if [[ ${parent%.*} != "$mod_name" ]]; then
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mod_file=""
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break
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fi
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if [[ $parent = *.mod || $parent = *.ko ]]; then
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mod_file=$parent
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continue
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fi
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mod_file=""
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break
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done
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if [[ -n $mod_file ]]; then
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PARENT="$mod_file"
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return
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fi
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ERROR_IF_DIFF="multiple parent matches for $file: ${parents[*]}"
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PARENT="${parents[0]}"
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}
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__find_parent_obj_in_dir() {
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local file="$1"
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local dir="$2"
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declare -a parents
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while IFS='' read -r parent; do
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parent="$(cmd_file_to_o_file "$parent")"
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[[ $parent -ef $file ]] && continue
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parents+=("$parent")
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done < <(grep -El "[ ]${file/./\\.}([ \)]|$)" "$dir"/.*.cmd)
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get_parent_from_parents "${parents[@]}"
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}
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find_parent_obj_in_dir() {
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local file="$1"
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local dir="$2"
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# make sure the dir has .cmd files
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if ! compgen -G "$dir"/.*.cmd > /dev/null; then
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PARENT=""
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return
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fi
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# 5.19+: ../acp/acp_hw.o
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__find_parent_obj_in_dir "$(relpath "$file" "$dir")" "$dir"
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[[ -n $PARENT ]] && return
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# pre-5.19 (and 5.19+ single-object modules):
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if [[ $file == $dir* ]]; then
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# arch/x86/kernel/smp.o
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__find_parent_obj_in_dir "$file" "$dir"
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else
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# drivers/gpu/drm/amd/amdgpu/../acp/acp_hw.o
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__find_parent_obj_in_dir "$dir"/"$(relpath "$file" "$dir")" "$dir"
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fi
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}
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find_parent_obj() {
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dir="$(dirname "$1")"
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absdir="$(readlink -f "$dir")"
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pwddir="$(readlink -f .)"
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pdir="${absdir#$pwddir/}"
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file="$(basename "$1")"
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grepname="${1%.o}"
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grepname="$grepname\\.o"
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if [[ "$DEEP_FIND" -eq 1 ]]; then
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num=0
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if [[ -n "$last_deep_find" ]]; then
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parent="$(grep -lw "$grepname" "$last_deep_find"/.*.cmd | filter_parent_obj "${pdir}" "${file}" | head -n1)"
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num="$(grep -lw "$grepname" "$last_deep_find"/.*.cmd | filter_parent_obj "${pdir}" "${file}" | wc -l)"
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fi
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if [[ "$num" -eq 0 ]]; then
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parent="$(find . -name ".*.cmd" -print0 | xargs -0 grep -lw "$grepname" | filter_parent_obj "${pdir}" "${file}" | cut -c3- | head -n1)"
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num="$(find . -name ".*.cmd" -print0 | xargs -0 grep -lw "$grepname" | filter_parent_obj "${pdir}" "${file}" | wc -l)"
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[[ "$num" -eq 1 ]] && last_deep_find="$(dirname "$parent")"
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fi
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else
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parent="$(grep -lw "$grepname" "$dir"/.*.cmd | filter_parent_obj "${dir}" "${file}" | head -n1)"
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num="$(grep -lw "$grepname" "$dir"/.*.cmd | filter_parent_obj "${dir}" "${file}" | wc -l)"
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local file="$1"
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# common case: look in same directory
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find_parent_obj_in_dir "$file" "$(dirname "$file")"
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[[ -n $PARENT ]] && return
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# if we previously had a successful deep find, try that dir first
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if [[ -n "$LAST_DEEP_FIND_DIR" ]]; then
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find_parent_obj_in_dir "$file" "$LAST_DEEP_FIND_DIR"
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[[ -n "$PARENT" ]] && return
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fi
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[[ "$num" -eq 0 ]] && PARENT="" && return
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[[ "$num" -gt 1 ]] && ERROR_IF_DIFF="two parent matches for $1"
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# prevent known deep finds
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if [[ $file = drivers/gpu/drm/amd/* ]]; then
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find_parent_obj_in_dir "$file" "drivers/gpu/drm/amd/amdgpu"
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[[ -n "$PARENT" ]] && return
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fi
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if [[ $file = virt/kvm/* ]]; then
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find_parent_obj_in_dir "$file" "arch/x86/kvm"
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[[ -n "$PARENT" ]] && return
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fi
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if [[ $file = drivers/oprofile/* ]]; then
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find_parent_obj_in_dir "$file" "arch/x86/oprofile"
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[[ -n "$PARENT" ]] && return
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fi
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dir="$(dirname "$parent")"
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PARENT="$(basename "$parent")"
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PARENT="${PARENT#.}"
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PARENT="${PARENT%.cmd}"
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[[ $dir != "." ]] && PARENT="$dir/$PARENT"
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[[ ! -e "$PARENT" ]] && die "ERROR: can't find parent $PARENT for $1"
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# check higher-level dirs
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local dir
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dir="$(dirname "$file")"
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while [[ ! $dir -ef . ]]; do
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dir="$(dirname "$dir")"
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find_parent_obj_in_dir "$file" "$dir"
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[[ -n $PARENT ]] && return
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done
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# slow path: search the entire tree ("deep find")
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echo 'doing "deep find" for parent object'
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declare -a parents
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while IFS= read -r -d '' dir; do
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find_parent_obj_in_dir "$file" "$dir"
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if [[ -n $PARENT ]]; then
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parents+=("$PARENT")
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LAST_DEEP_FIND_DIR="$dir"
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fi
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done < <(find . -type d -print0)
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get_parent_from_parents "${parents[@]}"
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}
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# find vmlinux or .ko associated with a .o file
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find_kobj() {
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arg="$1"
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local file="$1"
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if [[ -n $OOT_MODULE ]]; then
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KOBJFILE="$OOT_MODULE"
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return
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fi
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KOBJFILE="$arg"
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DEEP_FIND=0
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KOBJFILE="$file"
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ERROR_IF_DIFF=
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while true; do
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case "$KOBJFILE" in
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*.mod)
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KOBJFILE=${PARENT/.mod/.ko}
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[[ -e $KOBJFILE ]] || die "can't find .ko for $PARENT"
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return
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;;
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*.ko)
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return
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;;
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*/built-in.o|\
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*/built-in.a|\
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arch/x86/kernel/ebda.o|\
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arch/x86/kernel/head*.o|\
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arch/x86/kernel/platform-quirks.o|\
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arch/x86/lib/lib.a|\
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lib/lib.a)
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KOBJFILE=vmlinux
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return
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;;
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esac
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find_parent_obj "$KOBJFILE"
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[[ -n "$PARENT" ]] && DEEP_FIND=0
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if [[ -z "$PARENT" ]]; then
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[[ "$KOBJFILE" = *.ko ]] && return
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case "$KOBJFILE" in
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*/built-in.o|\
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*/built-in.a|\
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arch/x86/lib/lib.a|\
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arch/x86/kernel/head*.o|\
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arch/x86/kernel/ebda.o|\
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arch/x86/kernel/platform-quirks.o|\
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lib/lib.a)
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KOBJFILE=vmlinux
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return
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esac
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if [[ "$DEEP_FIND" -eq 0 ]]; then
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DEEP_FIND=1
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continue;
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fi
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die "invalid ancestor $KOBJFILE for $arg"
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fi
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[[ -z "$PARENT" ]] && die "invalid ancestor $KOBJFILE for $file"
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KOBJFILE="$PARENT"
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done
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}
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