From 7a7e836684feb33d4f5418e8bd44101faf6b3f44 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Tue, 9 Dec 2025 20:40:23 -0500 Subject: tracing: Fix unused tracepoints when module uses only exported ones Building the KVM intel module failed to build with UT=1: no __tracepoint_strings in file: arch/x86/kvm/kvm-intel.o make[3]: *** [/work/git/test-linux.git/scripts/Makefile.modfinal:62: arch/x86/kvm/kvm-intel.ko] Error 1 The reason is that the module only uses the tracepoints defined and exported by the main kvm module. The tracepoint-update.c code fails the build if a tracepoint is used, but there's no tracepoints defined. But this is acceptable in modules if the tracepoints are defined in the vmlinux proper or another module and exported. Do not fail to build if a tracepoint is used but no tracepoints are defined if the code is a module. This should still never happen for the vmlinux itself. Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Masahiro Yamada Link: https://patch.msgid.link/20251209204023.76941824@fedora Fixes: e30f8e61e2518 ("tracing: Add a tracepoint verification check at build time") Signed-off-by: Steven Rostedt (Google) --- scripts/tracepoint-update.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'scripts/tracepoint-update.c') diff --git a/scripts/tracepoint-update.c b/scripts/tracepoint-update.c index 7f7d90df14ce..90046aedc97b 100644 --- a/scripts/tracepoint-update.c +++ b/scripts/tracepoint-update.c @@ -210,6 +210,9 @@ static int process_tracepoints(bool mod, void *addr, const char *fname) } if (!tracepoint_data_sec) { + /* A module may reference only exported tracepoints */ + if (mod) + return 0; fprintf(stderr, "no __tracepoint_strings in file: %s\n", fname); return -1; } -- cgit v1.2.3