Revert "perf jevents: Handle deleted JSONS in out of source builds"

This reverts commit b56111d which is
commit 297c9d9 upstream.

It causes build issues for arm64.

Link: https://lore.kernel.org/r/200019ee-d40a-414f-9dfb-c3fcbdbed969@gmail.com
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: gregkh

tools/perf/pmu-events/Build

@@ -1,6 +1,5 @@
 pmu-events-y	+= pmu-events.o
 JSON		=  $(shell find pmu-events/arch -name '*.json' -o -name '*.csv')
-JSON_DIRS	=  $(shell find pmu-events/arch -type d)
 JDIR_TEST	=  pmu-events/arch/test
 JSON_TEST	=  $(shell [ -d $(JDIR_TEST) ] &&			\
 			find $(JDIR_TEST) -name '*.json')
@@ -32,23 +31,16 @@ $(PMU_EVENTS_C): $(EMPTY_PMU_EVENTS_C)
 else
 # Copy checked-in json to OUTPUT for generation if it's an out of source build
 ifneq ($(OUTPUT),)
-# Remove all output directories when any source directory timestamp changes
-# so there are no stale deleted files
-JSON_DIRS_ROOT = $(OUTPUT)pmu-events/arch/
-$(JSON_DIRS_ROOT): $(JSON_DIRS)
-	$(Q)$(call echo-cmd,gen)rm -rf $@
-	$(Q)mkdir -p $@
-
-$(OUTPUT)pmu-events/arch/%: pmu-events/arch/% $(JSON_DIRS_ROOT)
+$(OUTPUT)pmu-events/arch/%: pmu-events/arch/%
 	$(call rule_mkdir)
 	$(Q)$(call echo-cmd,gen)cp $< $@
 endif
 
-$(LEGACY_CACHE_JSON): $(LEGACY_CACHE_PY) $(JSON_DIRS_ROOT)
+$(LEGACY_CACHE_JSON): $(LEGACY_CACHE_PY)
 	$(call rule_mkdir)
 	$(Q)$(call echo-cmd,gen)$(PYTHON) $(LEGACY_CACHE_PY) > $@
 
-GEN_JSON = $(patsubst %,$(OUTPUT)%,$(JSON)) $(LEGACY_CACHE_JSON) $(JSON_DIRS)
+GEN_JSON = $(patsubst %,$(OUTPUT)%,$(JSON)) $(LEGACY_CACHE_JSON)
 
 $(METRIC_TEST_LOG): $(METRIC_TEST_PY) $(METRIC_PY)
 	$(call rule_mkdir)