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tracing: Add warnings for unused tracepoints for modules 

If a modules has TRACE_EVENT() but does not use it, add a warning about it
at build time.

Currently, the build must be made by adding "UT=1" to the make command
line in order for this to trigger.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas.schier@linux.dev>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/20251022004453.422000794@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2025-10-21 20:43:43 -04:00 committed by Steven Rostedt (Google)
parent eec3516b25
commit 01ecf7af00
1 changed files with 5 additions and 0 deletions
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5
scripts/Makefile.modfinal
View File

@ -28,6 +28,10 @@ ccflags-remove-y := $(CC_FLAGS_CFI)
.module-common.o: $(srctree)/scripts/module-common.c FORCE .module-common.o: $(srctree)/scripts/module-common.c FORCE
$(call if_changed_rule,cc_o_c) $(call if_changed_rule,cc_o_c)
ifneq ($(WARN_ON_UNUSED_TRACEPOINTS),)
cmd_check_tracepoint = $(objtree)/scripts/tracepoint-update --module $<;
endif
quiet_cmd_ld_ko_o = LD [M] $@ quiet_cmd_ld_ko_o = LD [M] $@
cmd_ld_ko_o = \ cmd_ld_ko_o = \
$(LD) -r $(KBUILD_LDFLAGS) \ $(LD) -r $(KBUILD_LDFLAGS) \
@ -57,6 +61,7 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
ifdef CONFIG_DEBUG_INFO_BTF_MODULES ifdef CONFIG_DEBUG_INFO_BTF_MODULES
+$(if $(newer-prereqs),$(call cmd,btf_ko)) +$(if $(newer-prereqs),$(call cmd,btf_ko))
endif endif
+$(call cmd,check_tracepoint)
targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) .module-common.o targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) .module-common.o