diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -810,6 +810,25 @@ ifdef CONFIG_FUNCTION_TRACER CC_FLAGS_FTRACE := -pg endif +ifdef CONFIG_TRACEPOINTS +# To check for unused tracepoints (tracepoints that are defined but never +# called), run with: +# +# make UT=1 +# +# Each unused tracepoints can take up to 5KB of memory in the running kernel. +# It is best to remove any that are not used. +# +# This command line option will be removed when all current unused +# tracepoints are removed. + +ifeq ("$(origin UT)", "command line") + WARN_ON_UNUSED_TRACEPOINTS := $(UT) +endif +endif # CONFIG_TRACEPOINTS + +export WARN_ON_UNUSED_TRACEPOINTS + include $(srctree)/arch/$(SRCARCH)/Makefile ifdef need-config @@ -1772,6 +1791,8 @@ help: @echo ' c: extra checks in the configuration stage (Kconfig)' @echo ' e: warnings are being treated as errors' @echo ' Multiple levels can be combined with W=12 or W=123' + @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' + @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' @$(if $(dtstree), \ echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ |