linux-kernel - [tip:perf/core] perf probe: Fix a precedence bug

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Message-ID: <tip-f56847c2e99810781f6941d01baff9ae223eeac3@git.kernel.org>
Date:	Sat, 28 Feb 2015 01:32:19 -0800
From:	tip-bot for He Kuang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hekuang@...wei.com, masami.hiramatsu.pt@...achi.com,
	wangnan0@...wei.com, acme@...hat.com, linux-kernel@...r.kernel.org,
	mingo@...nel.org, hpa@...or.com, tglx@...utronix.de
Subject: [tip:perf/core] perf probe: Fix a precedence bug

Commit-ID:  f56847c2e99810781f6941d01baff9ae223eeac3
Gitweb:     http://git.kernel.org/tip/f56847c2e99810781f6941d01baff9ae223eeac3
Author:     He Kuang <hekuang@...wei.com>
AuthorDate: Fri, 27 Feb 2015 18:52:53 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 27 Feb 2015 10:31:09 -0300

perf probe: Fix a precedence bug

The minus operator has higher precedence than ?: Add parentheses around
?: fix this.

Before this patch:

  $ echo 'p:myprobe do_sys_open' > /sys/kernel/debug/tracing/kprobe_events
  $ perf probe -l -k ../vmlinux
    kprobes:myprobe      (on do_sys_open)

After this patch:

  $ echo 'p:myprobe do_sys_open' > /sys/kernel/debug/tracing/kprobe_events
  $ perf probe -l -k ../vmlinux
    kprobes:myprobe      (on do_sys_open@...ux.git/fs/open.c)

Signed-off-by: He Kuang <hekuang@...wei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1425034373-14511-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 9526cf3..7c0e765 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -151,7 +151,7 @@ static u64 kernel_get_symbol_address_by_name(const char *name, bool reloc)
 		sym = __find_kernel_function_by_name(name, &map);
 		if (sym)
 			return map->unmap_ip(map, sym->start) -
-				(reloc) ? 0 : map->reloc;
+				((reloc) ? 0 : map->reloc);
 	}
 	return 0;
 }
--
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