linux-kernel - [PATCH v4 3/7] perf pmu-events: Make pmu-events a library

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Message-Id: <20240625184224.929018-4-irogers@google.com>
Date: Tue, 25 Jun 2024 11:42:20 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, James Clark <james.clark@....com>, 
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, Guo Ren <guoren@...nel.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Yicong Yang <yangyicong@...ilicon.com>, Jonathan Cameron <jonathan.cameron@...wei.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, 
	Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>, 
	Nick Terrell <terrelln@...com>, Andrei Vagin <avagin@...gle.com>, Kees Cook <keescook@...omium.org>, 
	Oliver Upton <oliver.upton@...ux.dev>, Ze Gao <zegao2021@...il.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/7] perf pmu-events: Make pmu-events a library

Make pmu-events into a library so it may be linked against things like
the python module and not built from source.

Signed-off-by: Ian Rogers <irogers@...gle.com>
Reviewed-by: James Clark <james.clark@....com>
---
 tools/perf/Makefile.perf | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index c5a027381c55..9640c6ae1837 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -428,11 +428,14 @@ export PERL_PATH
 LIBPERF_UI_IN := $(OUTPUT)perf-ui-in.o
 LIBPERF_UI := $(OUTPUT)libperf-ui.a
 
+LIBPMU_EVENTS_IN := $(OUTPUT)pmu-events/pmu-events-in.o
+LIBPMU_EVENTS := $(OUTPUT)libpmu-events.a
+
 PERFLIBS = $(LIBAPI) $(LIBPERF) $(LIBSUBCMD) $(LIBSYMBOL)
 ifdef LIBBPF_STATIC
   PERFLIBS += $(LIBBPF)
 endif
-PERFLIBS += $(LIBPERF_UI)
+PERFLIBS += $(LIBPERF_UI) $(LIBPMU_EVENTS)
 
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If
@@ -721,8 +724,6 @@ strip: $(PROGRAMS) $(OUTPUT)perf
 	$(STRIP) $(STRIP_OPTS) $(PROGRAMS) $(OUTPUT)perf
 
 PERF_IN := $(OUTPUT)perf-in.o
-
-PMU_EVENTS_IN := $(OUTPUT)pmu-events/pmu-events-in.o
 export NO_JEVENTS
 
 build := -f $(srctree)/tools/build/Makefile.build dir=. obj
@@ -730,18 +731,21 @@ build := -f $(srctree)/tools/build/Makefile.build dir=. obj
 $(PERF_IN): prepare FORCE
 	$(Q)$(MAKE) $(build)=perf
 
-$(PMU_EVENTS_IN): FORCE prepare
+$(LIBPMU_EVENTS_IN): FORCE prepare
 	$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=pmu-events obj=pmu-events
 
+$(LIBPMU_EVENTS): $(LIBPMU_EVENTS_IN)
+	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $<
+
 $(LIBPERF_UI_IN): FORCE prepare
 	$(Q)$(MAKE) $(build)=perf-ui
 
 $(LIBPERF_UI): $(LIBPERF_UI_IN)
 	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $<
 
-$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN) $(PMU_EVENTS_IN)
+$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN)
 	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
-		$(PERF_IN) $(PMU_EVENTS_IN) $(LIBS) -o $@
+		$(PERF_IN) $(LIBS) -o $@
 
 $(GTK_IN): FORCE prepare
 	$(Q)$(MAKE) $(build)=gtk
-- 
2.45.2.741.gdbec12cfda-goog