Madhavan Srinivasan <maddy@xxxxxxxxxxxxx> writes: > When running `make -C powerpc/pmu run_tests` from top level selftests > directory, currently this error is being reported > > make: Entering directory '/home/maddy/linux/tools/testing/selftests/powerpc/pmu' > Makefile:40: warning: overriding recipe for target 'emit_tests' > ../../lib.mk:111: warning: ignoring old recipe for target 'emit_tests' > gcc -m64 count_instructions.c ../harness.c event.c lib.c ../utils.c loop.S -o /home/maddy/selftest_output//count_instructions > In file included from count_instructions.c:13: > event.h:12:10: fatal error: utils.h: No such file or directory > 12 | #include "utils.h" > | ^~~~~~~~~ > compilation terminated. > > This is due to missing of include path in CFLAGS. That is, CFLAGS and > GIT_VERSION macros are defined in the powerpc/ folder Makefile which > in this case not involved. > > To address the failure incase of executing specific sub-folder test directly, > a new rule file has been addded by the patch called "flags.mk" under > selftest/powerpc/ folder and is linked to all the Makefile of powerpc/pmu > sub-folders. This patch made my selftest build go from ~10s to ~50s ! I tracked it down to "git describe" being run hundreds of times. > diff --git a/tools/testing/selftests/powerpc/flags.mk b/tools/testing/selftests/powerpc/flags.mk > new file mode 100644 > index 000000000000..28374f470126 > --- /dev/null > +++ b/tools/testing/selftests/powerpc/flags.mk > @@ -0,0 +1,12 @@ > +#This checks for any ENV variables and add those. > + > +#ifeq ($(GIT_VERSION),) This isn't right, # is a comment in make syntax, so this line is just a comment. It needs to be "ifeq". > +GIT_VERSION = $(shell git describe --always --long --dirty || echo "unknown") Using '=' here means Make re-runs the command every time the variable is used. Previously that was OK because the variable was set once and then exported. But now that it's a Make variable in each file it leads to "git describe" being run a few hundred times. I've squashed in those fixes, no need to send a v2. cheers
