linux-kernel - [PATCH v1 10/13] perf build: Switch libpfm4 to opt-out rather than opt-in

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Date:   Fri, 10 Mar 2023 22:57:50 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Quentin Monnet <quentin@...valent.com>,
        Andres Freund <andres@...razel.de>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Pavithra Gurushankar <gpavithrasha@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>,
        "Martin Liška" <mliska@...e.cz>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        llvm@...ts.linux.dev
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 10/13] perf build: Switch libpfm4 to opt-out rather than opt-in

If libpfm4 passes the feature test, it would be nice to have it
enabled rather than also requiring the LIBPFM4=1 build flag.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/Makefile.config | 3 +--
 tools/perf/Makefile.perf   | 2 +-
 tools/perf/tests/make      | 4 ++--
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index fdeca45cf15f..9754218bd418 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -1130,7 +1130,7 @@ ifdef LIBCLANGLLVM
   endif
 endif
 
-ifdef LIBPFM4
+ifndef NO_LIBPFM4
   $(call feature_check,libpfm4)
   ifeq ($(feature-libpfm4), 1)
     CFLAGS += -DHAVE_LIBPFM
@@ -1139,7 +1139,6 @@ ifdef LIBPFM4
     $(call detected,CONFIG_LIBPFM4)
   else
     msg := $(warning libpfm4 not found, disables libpfm4 support. Please install libpfm4-dev);
-    NO_LIBPFM4 := 1
   endif
 endif
 
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index a35bc995d5d8..3e06915f6bd0 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -122,7 +122,7 @@ include ../scripts/utilities.mak
 # generated from the kernel .tbl or unistd.h files and use, if available, libaudit
 # for doing the conversions to/from strings/id.
 #
-# Define LIBPFM4 to enable libpfm4 events extension.
+# Define NO_LIBPFM4 to disable libpfm4 events extension.
 #
 # Define NO_LIBDEBUGINFOD if you do not want support debuginfod
 #
diff --git a/tools/perf/tests/make b/tools/perf/tests/make
index c2f74ed43418..47c665659022 100644
--- a/tools/perf/tests/make
+++ b/tools/perf/tests/make
@@ -94,7 +94,7 @@ make_with_coresight := CORESIGHT=1
 make_no_sdt	    := NO_SDT=1
 make_no_syscall_tbl := NO_SYSCALL_TABLE=1
 make_with_clangllvm := LIBCLANGLLVM=1
-make_with_libpfm4   := LIBPFM4=1
+make_no_libpfm4     := NO_LIBPFM4=1
 make_with_gtk2      := GTK2=1
 make_tags           := tags
 make_cscope         := cscope
@@ -161,7 +161,7 @@ run += make_no_syscall_tbl
 run += make_with_babeltrace
 run += make_with_coresight
 run += make_with_clangllvm
-run += make_with_libpfm4
+run += make_no_libpfm4
 run += make_help
 run += make_doc
 run += make_perf_o
-- 
2.40.0.rc1.284.g88254d51c5-goog