1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# Correlating ThinLTO-promoted locals requires demangling the .llvm.<hash> 5# suffix, and the resulting klp relocation must name the original symbol: that 6# is the one in the running kernel's kallsyms. 7 8. "$(dirname "$0")/../lib.sh" 9 10setup 11clang_only "ThinLTO requires clang" 12 13find_thinlto_toolchain || 14 probe_skip "no matching clang/lld pair for a ThinLTO link; set THIN_LD to one" 15 16build_thinlto() # $1 output object, $2 extra flags 17{ 18 $THIN_CC -flto=thin -O2 -ffunction-sections -fdata-sections $2 \ 19 -c "$FIXTURES_DIR/thinlto_local.c" -o "$workdir/tu_a.o" 2>/dev/null || return 1 20 $THIN_CC -flto=thin -O2 -ffunction-sections -fdata-sections $2 -DTU_B \ 21 -c "$FIXTURES_DIR/thinlto_local.c" -o "$workdir/tu_b.o" 2>/dev/null || return 1 22 "$THIN_LD" -r "$workdir/tu_a.o" "$workdir/tu_b.o" -o "$1" 2>/dev/null || return 1 23} 24 25build_thinlto "$workdir/orig.o" "" || 26 probe_skip "ThinLTO build failed ($THIN_CC, $THIN_LD)" 27build_thinlto "$workdir/patched.o" -DPATCHED || 28 probe_skip "ThinLTO build failed ($THIN_CC, $THIN_LD)" 29 30orig_sym="$(in_symbols orig.o | grep -o 'counter\.llvm\.[0-9]*' | head -1)" 31new_sym="$( in_symbols patched.o | grep -o 'counter\.llvm\.[0-9]*' | head -1)" 32 33[ -n "$orig_sym" ] && [ -n "$new_sym" ] || 34 probe_skip "$THIN_CC did not promote the local symbol" 35 36# Equal hashes would make plain name matching work, testing nothing. 37[ "$orig_sym" != "$new_sym" ] || 38 probe_skip "$THIN_CC gave the same ThinLTO hash for both builds" 39 40run_diff 41assert_patched target 42 43out_symbols | grep -q "\.klp\.sym\.vmlinux\.$orig_sym," || 44 fail "expected a klp relocation naming $orig_sym" 45out_symbols | grep -q "\.klp\.sym\.vmlinux\.$new_sym," && 46 fail "klp relocation names $new_sym, which the running kernel does not have" 47 48pass "ThinLTO-mangled local correlated across differing hashes ($THIN_CC, $THIN_LD)" 49