linux-kernel - [PATCH] perf probe: Fix getting the kernel map

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Date:   Mon, 4 Mar 2019 15:13:21 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        luto@...nel.org, Jiufei Xue <jiufei.xue@...ux.alibaba.com>,
        Xu Yu <xuyu@...ux.alibaba.com>, peterz@...radead.org,
        mingo@...hat.com
Subject: [PATCH] perf probe: Fix getting the kernel map

Since commit 4d99e4136580 ("perf machine: Workaround missing maps for x86
PTI entry trampolines"), perf tools has been creating more than one kernel
map, however 'perf probe' assumed there could be only one.

Fix by using machine__kernel_map() to get the main kernel map.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Fixes: 4d99e4136580 ("perf machine: Workaround missing maps for x86 PTI entry trampolines")
Fixes: d83212d5dd67 ("kallsyms, x86: Export addresses of PTI entry trampolines")
Tested-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
Cc: stable@...r.kernel.org
---
 tools/perf/util/probe-event.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index e86f8be89157..6cd96f9b346d 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -157,8 +157,10 @@ static struct map *kernel_get_module_map(const char *module)
 	if (module && strchr(module, '/'))
 		return dso__new_map(module);
 
-	if (!module)
-		module = "kernel";
+	if (!module) {
+		pos = machine__kernel_map(host_machine);
+		return map__get(pos);
+	}
 
 	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 		/* short_name is "[module]" */
-- 
2.19.1