With CONFIG_LTO_CLANG, the compiler/linker adds .llvm.<hash> suffix to local symbols to avoid duplications. Existing scripts/kallsyms sorts symbols without .llvm.<hash> suffix. However, this causes quite some issues later on. Some users of kallsyms, such as livepatch, have to match symbols exactly. Address this by sorting full symbols at build time, and let kallsyms lookup APIs to match the symbols exactly. Changes v2 => v3: 1. Remove the _without_suffix APIs, as kprobe will not use them. (Masami Hiramatsu) v2: https://lore.kernel.org/live-patching/20240802210836.2210140-1-song@xxxxxxxxxx/T/#u Changes v1 => v2: 1. Update the APIs to remove all .XXX suffixes (v1 only removes .llvm.*). 2. Rename the APIs as *_without_suffix. (Masami Hiramatsu) 3. Fix another user from kprobe. (Masami Hiramatsu) 4. Add tests for the new APIs in kallsyms_selftests. v1: https://lore.kernel.org/live-patching/20240730005433.3559731-1-song@xxxxxxxxxx/T/#u Song Liu (2): kallsyms: Do not cleanup .llvm.<hash> suffix before sorting symbols kallsyms: Match symbols exactly with CONFIG_LTO_CLANG kernel/kallsyms.c | 55 +++++--------------------------------- kernel/kallsyms_selftest.c | 22 +-------------- scripts/kallsyms.c | 31 ++------------------- scripts/link-vmlinux.sh | 4 --- 4 files changed, 9 insertions(+), 103 deletions(-) -- 2.43.5
