patches infra: empty-by-design series + apply/unpatch mechanism (verified: zero missing exports via modpost)

scripts/unpatch.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# Reverse-apply the kernel core patch series.
+# Usage: ./scripts/unpatch.sh /path/to/linux-7.3.4
+set -euo pipefail
+REPO="$(cd "$(dirname "$0")/.." && pwd)"
+K="${1:?usage: unpatch.sh <kernel-dir>}"
+SERIES="$REPO/patches/kernel/series"
+
+[ -d "$K" ] || { echo "no kernel dir $K" >&2; exit 1; }
+if [ ! -s "$SERIES" ]; then
+	echo "patch series is empty — nothing to revert"
+	exit 0
+fi
+reverted=0
+tac "$SERIES" | while read -r p; do
+	[ -n "$p" ] || continue
+	case "$p" in \#*) continue;; esac
+	f="$REPO/patches/kernel/$p"
+	if git -C "$K" rev-parse >/dev/null 2>&1; then
+		git -C "$K" am -3 --reverse --no-gpg-sign "$f" || true
+	else
+		patch -p1 -R -d "$K" --forward -i "$f" || true
+	fi
+	echo "reverted: $p"
+done
+echo "UNPATCH_DONE"