linux-kernel - [tip:perf/core] perf record: Use WARN

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Date:	Sat, 5 Mar 2016 00:15:54 -0800
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, lizefan@...wei.com, ast@...nel.org,
	mingo@...nel.org, jolsa@...nel.org, acme@...hat.com,
	hekuang@...wei.com, namhyung@...nel.org, tglx@...utronix.de,
	masami.hiramatsu.pt@...achi.com, wangnan0@...wei.com,
	hpa@...or.com, peterz@...radead.org
Subject: [tip:perf/core] perf record: Use WARN_ONCE to replace 'if'
 condition

Commit-ID:  d8871ea71281ed689dc3303d1b50eb00c5d06141
Gitweb:     http://git.kernel.org/tip/d8871ea71281ed689dc3303d1b50eb00c5d06141
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Fri, 26 Feb 2016 09:32:06 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 3 Mar 2016 11:10:34 -0300

perf record: Use WARN_ONCE to replace 'if' condition

Commits in a BPF patchkit will extract kernel and module synthesizing
code into a separated function and call it multiple times. This patch
replace 'if (err < 0)' using WARN_ONCE, makes sure the error message
show one time.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Li Zefan <lizefan@...wei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1456479154-136027-19-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 7d11162..9dec7e5 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -33,6 +33,7 @@
 #include "util/parse-regs-options.h"
 #include "util/llvm-utils.h"
 #include "util/bpf-loader.h"
+#include "asm/bug.h"
 
 #include <unistd.h>
 #include <sched.h>
@@ -615,17 +616,15 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 
 	err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
 						 machine);
-	if (err < 0)
-		pr_err("Couldn't record kernel reference relocation symbol\n"
-		       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
-		       "Check /proc/kallsyms permission or run as root.\n");
+	WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
+			   "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+			   "Check /proc/kallsyms permission or run as root.\n");
 
 	err = perf_event__synthesize_modules(tool, process_synthesized_event,
 					     machine);
-	if (err < 0)
-		pr_err("Couldn't record kernel module information.\n"
-		       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
-		       "Check /proc/modules permission or run as root.\n");
+	WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
+			   "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+			   "Check /proc/modules permission or run as root.\n");
 
 	if (perf_guest) {
 		machines__process_guests(&session->machines,