iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf probe: Fix getting the kernel map

Browse Source 
Since commit 4d99e41365 ("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@intel.com>
Tested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Cc: Xu Yu <xuyu@linux.alibaba.com>
Fixes: 4d99e41365 ("perf machine: Workaround missing maps for x86 PTI entry trampolines")
Fixes: d83212d5dd ("kallsyms, x86: Export addresses of PTI entry trampolines")
Link: http://lkml.kernel.org/r/2ed432de-e904-85d2-5c36-5897ddc5b23b@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-03-04 15:13:21 +02:00 committed by Arnaldo Carvalho de Melo
parent 2a1292cbd4
commit eaeffeb983
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
tools/perf/util/probe-event.c
View File

@ -160,8 +160,10 @@ 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]" */