Messages in this thread Patch in this message | | | Date | Sat, 5 Mar 2016 00:15:54 -0800 | From | tip-bot for Wang Nan <> | Subject | [tip:perf/core] perf record: Use WARN_ONCE to replace 'if' condition |
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Commit-ID: d8871ea71281ed689dc3303d1b50eb00c5d06141 Gitweb: http://git.kernel.org/tip/d8871ea71281ed689dc3303d1b50eb00c5d06141 Author: Wang Nan <wangnan0@huawei.com> AuthorDate: Fri, 26 Feb 2016 09:32:06 +0000 Committer: Arnaldo Carvalho de Melo <acme@redhat.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@huawei.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Li Zefan <lizefan@huawei.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1456479154-136027-19-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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,
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