linux-kernel - [tip:perf/urgent] perf tools: Fix PowerPC native building

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Date:	Tue, 12 Jan 2016 02:10:05 -0800
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tglx@...utronix.de, acme@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, jolsa@...nel.org, mingo@...nel.org,
	wangnan0@...wei.com, naveen.n.rao@...ux.vnet.ibm.com,
	sukadev@...ux.vnet.ibm.com, lizefan@...wei.com
Subject: [tip:perf/urgent] perf tools: Fix PowerPC native building

Commit-ID:  8f9e05fb298f16c0cda2e7e78b603331a79f9c10
Gitweb:     http://git.kernel.org/tip/8f9e05fb298f16c0cda2e7e78b603331a79f9c10
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Mon, 11 Jan 2016 13:47:57 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 11 Jan 2016 19:22:20 -0300

perf tools: Fix PowerPC native building

Checks BPF syscall number, turn off libbpf building on platform doesn't
correctly support sys_bpf instead of blocking compiling.

Reported-and-Tested-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1452520124-2073-7-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/build/feature/test-bpf.c | 20 +++++++++++++++++++-
 tools/lib/bpf/bpf.c            |  4 ++--
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/tools/build/feature/test-bpf.c b/tools/build/feature/test-bpf.c
index 062bac8..b389026 100644
--- a/tools/build/feature/test-bpf.c
+++ b/tools/build/feature/test-bpf.c
@@ -1,9 +1,23 @@
+#include <asm/unistd.h>
 #include <linux/bpf.h>
+#include <unistd.h>
+
+#ifndef __NR_bpf
+# if defined(__i386__)
+#  define __NR_bpf 357
+# elif defined(__x86_64__)
+#  define __NR_bpf 321
+# elif defined(__aarch64__)
+#  define __NR_bpf 280
+#  error __NR_bpf not defined. libbpf does not support your arch.
+# endif
+#endif
 
 int main(void)
 {
 	union bpf_attr attr;
 
+	/* Check fields in attr */
 	attr.prog_type = BPF_PROG_TYPE_KPROBE;
 	attr.insn_cnt = 0;
 	attr.insns = 0;
@@ -14,5 +28,9 @@ int main(void)
 	attr.kern_version = 0;
 
 	attr = attr;
-	return 0;
+	/*
+	 * Test existence of __NR_bpf and BPF_PROG_LOAD.
+	 * This call should fail if we run the testcase.
+	 */
+	return syscall(__NR_bpf, BPF_PROG_LOAD, attr, sizeof(attr));
 }
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 5bdc6ea..1f91cc9 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -14,8 +14,8 @@
 #include "bpf.h"
 
 /*
- * When building perf, unistd.h is override. Define __NR_bpf is
- * required to be defined.
+ * When building perf, unistd.h is overrided. __NR_bpf is
+ * required to be defined explicitly.
  */
 #ifndef __NR_bpf
 # if defined(__i386__)