linux-kernel - [PATCH -tip v2 2/8] perf-probe: Remove incorrect symbol check for --list

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Message-ID: <20140129091455.22141.59802.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp>
Date:	Wed, 29 Jan 2014 09:14:55 +0000
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"David A. Long" <dave.long@...aro.org>,
	yrl.pp-manager.tt@...achi.com, Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH -tip v2 2/8] perf-probe: Remove incorrect symbol check for
 --list

Remove unneeded symbol check for --list option.
This code actually checks whether the given symbol exists
in the kernel. But this is incorrect for online kernel/module
and offline module too.
 - For online kernel/module, the kprobes itself already
  ensured the symbol exist in the kernel.
 - For offline module, this code can't access the offlined
  modules. Ignore it.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---
 tools/perf/util/probe-event.c |    8 --------
 1 file changed, 8 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 14c649df..48498c6 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -743,14 +743,6 @@ out:
 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
 					struct perf_probe_point *pp)
 {
-	struct symbol *sym;
-
-	sym = __find_kernel_function_by_name(tp->symbol, NULL);
-	if (!sym) {
-		pr_err("Failed to find symbol %s in kernel.\n", tp->symbol);
-		return -ENOENT;
-	}
-
 	return convert_to_perf_probe_point(tp, pp);
 }
 


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