linux-kernel - [RFC PATCH v2 08/26] perf bpf: Add UBPF flags and makefile options

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Date:	Sun, 26 Jun 2016 11:21:00 +0000
From:	He Kuang <hekuang@...wei.com>
To:	<acme@...nel.org>, <peterz@...radead.org>, <mingo@...hat.com>,
	<jolsa@...hat.com>, <brendan.d.gregg@...il.com>, <ast@...nel.org>,
	<alexander.shishkin@...ux.intel.com>, <wangnan0@...wei.com>,
	<hekuang@...wei.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: [RFC PATCH v2 08/26] perf bpf: Add UBPF flags and makefile options

From: Wang Nan <wangnan0@...wei.com>

UBPF are not built by default, unless user explicitly build perf with
UBPF defined.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Signed-off-by: He Kuang <hekuang@...wei.com>
---
 tools/lib/bpf/Makefile     | 4 ++++
 tools/perf/Makefile.perf   | 2 ++
 tools/perf/config/Makefile | 4 ++++
 3 files changed, 10 insertions(+)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index fc1bc75..1fb098d 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -120,6 +120,10 @@ ifeq ($(feature-libelf-getphdrnum), 1)
   override CFLAGS += -DHAVE_ELF_GETPHDRNUM_SUPPORT
 endif
 
+ifdef UBPF
+    override CFLAGS += -DHAVE_UBPF_SUPPORT
+endif
+
 # Append required CFLAGS
 override CFLAGS += $(EXTRA_WARNINGS)
 override CFLAGS += -Werror -Wall
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index d0a2cb1..114a719 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -81,6 +81,8 @@ include ../scripts/utilities.mak
 #
 # Define NO_LIBBPF if you do not want BPF support
 #
+# Define UBPF if you DO want user space BPF support
+#
 # Define FEATURES_DUMP to provide features detection dump file
 # and bypass the feature detection
 
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 534c811..2a64534 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -329,6 +329,10 @@ ifndef NO_LIBELF
     ifeq ($(feature-bpf), 1)
       CFLAGS += -DHAVE_LIBBPF_SUPPORT
       $(call detected,CONFIG_LIBBPF)
+      ifdef UBPF
+        CFLAGS += -DHAVE_UBPF_SUPPORT
+        $(call detected,CONFIG_UBPF)
+      endif
     endif
 
     ifndef NO_DWARF
-- 
1.8.5.2