5.15-stable review patch. If anyone has any objections, please let me know.
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From: Namhyung Kim namhyung@kernel.org
[ Upstream commit 7822a8913f4c51c7d1aff793b525d60c3384fb5b ]
The bison and flex generate C files from the source (.y and .l) files. When O= option is used, they are saved in a separate directory but the default build rule assumes the .C files are in the source directory. So it might read invalid file if there are generated files from an old version. The same is true for the pmu-events files.
For example, the following command would cause a build failure:
$ git checkout v6.3 $ make -C tools/perf # build in the same directory
$ git checkout v6.5-rc2 $ mkdir build # create a build directory $ make -C tools/perf O=build # build in a different directory but it # refers files in the source directory
Let's update the build rule to specify those cases explicitly to depend on the files in the output directory.
Note that it's not a complete fix and it needs the next patch for the include path too.
Fixes: 80eeb67fe577aa76 ("perf jevents: Program to convert JSON file") Signed-off-by: Namhyung Kim namhyung@kernel.org Cc: Adrian Hunter adrian.hunter@intel.com Cc: Andi Kleen ak@linux.intel.com Cc: Anup Sharma anupnewsmail@gmail.com Cc: Ian Rogers irogers@google.com Cc: Ingo Molnar mingo@kernel.org Cc: Jiri Olsa jolsa@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230728022447.1323563-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/build/Makefile.build | 10 ++++++++++ tools/perf/pmu-events/Build | 6 ++++++ 2 files changed, 16 insertions(+)
diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build index 715092fc6a239..0f0aba16bdee7 100644 --- a/tools/build/Makefile.build +++ b/tools/build/Makefile.build @@ -116,6 +116,16 @@ $(OUTPUT)%.s: %.c FORCE $(call rule_mkdir) $(call if_changed_dep,cc_s_c)
+# bison and flex files are generated in the OUTPUT directory +# so it needs a separate rule to depend on them properly +$(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,$(host)cc_o_c) + +$(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,$(host)cc_o_c) + # Gather build data: # obj-y - list of build objects # subdir-y - list of directories to nest diff --git a/tools/perf/pmu-events/Build b/tools/perf/pmu-events/Build index 5ec5ce8c31bab..ea8c41f9c7398 100644 --- a/tools/perf/pmu-events/Build +++ b/tools/perf/pmu-events/Build @@ -25,3 +25,9 @@ $(OUTPUT)pmu-events/pmu-events.c: $(JSON) $(JSON_TEST) $(JEVENTS_PY) $(call rule_mkdir) $(Q)$(call echo-cmd,gen)$(PYTHON) $(JEVENTS_PY) $(SRCARCH) pmu-events/arch $@ endif + +# pmu-events.c file is generated in the OUTPUT directory so it needs a +# separate rule to depend on it properly +$(OUTPUT)pmu-events/pmu-events.o: $(PMU_EVENTS_C) + $(call rule_mkdir) + $(call if_changed_dep,cc_o_c)