595.71.05

kernel-open/pahole.sh

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+if [ "$KBUILD_VERBOSE" = "1" ]; then
+    set -x
+fi
+
+PAHOLE=${ORIG_PAHOLE:-pahole}
+# Use DRY_RUN=echo to print the command instead of executing it, for debugging.
+DRY_RUN=${DRY_RUN:-}
+
+btf_encode=0
+lang_exclude=
+
+# Parse args: detect BTF encoding and existing --lang_exclude, while
+# rebuilding the argument list without --lang_exclude.
+args_start=0
+for arg in "$@"; do
+    case "$arg" in
+    --btf_features=*encode_force* | -J | --btf_encode | --btf_encode_force)
+        btf_encode=1
+        ;;
+    --lang_exclude=*)
+        lang_exclude="${arg#*=}"
+        # Drop this arg from the rebuilt list.
+        if [ $args_start -eq 0 ]; then
+            set --
+            args_start=1
+        fi
+        continue
+        ;;
+    esac
+    if [ $args_start -eq 0 ]; then
+        set -- "$arg"
+        args_start=1
+    else
+        set -- "$@" "$arg"
+    fi
+done
+
+# Capture anything the kernel is already excluding and extend it with c++.
+# Even if in future the kernel doesn't have to exclude other languages,
+# make sure to exclude c++ when generating encoding BTF.
+if [ $btf_encode -eq 1 ] || [ -n "$lang_exclude" ]; then
+    if [ -n "$lang_exclude" ]; then
+        lang_exclude="${lang_exclude},c++"
+    else
+        lang_exclude="c++"
+    fi
+    set -- --lang_exclude="$lang_exclude" "$@"
+
+    $DRY_RUN "$PAHOLE" "$@"
+    ret=$?
+
+    # Until pahole 1.31, return code was still an error regardless of
+    # --btf_encode_force / --btf_features=encode_force.
+    # A pure version check is not possible as it's likely that pahole
+    # from distros will have fixes backported. Just ignore the error for now.
+    if [ $ret -ne 0 ]; then
+        echo "pahole.sh: warning: pahole exited with status $ret (ignored)" >&2
+    fi
+    exit 0
+fi
+
+# Do not override options or exit status, as this may interfere with the kernel
+# build system when determining pahole version and options.
+$DRY_RUN exec "$PAHOLE" "$@"