From: David Ahern <[email protected]>

Required for off-box analysis to convert kernel addresses.

Signed-off-by: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Link: 
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/Documentation/perf-diff.txt | 3 +++
 tools/perf/builtin-diff.c              | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/tools/perf/Documentation/perf-diff.txt 
b/tools/perf/Documentation/perf-diff.txt
index 518266192d67..d1deb573877f 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -31,6 +31,9 @@ OPTIONS
 --dump-raw-trace::
         Dump raw trace in ASCII.
 
+--kallsyms=<file>::
+        kallsyms pathname
+
 -m::
 --modules::
         Load module symbols. WARNING: use only with -k and LIVE kernel
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 473887d1d61a..df6307b4050a 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -791,6 +791,8 @@ static const struct option options[] = {
        OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
                    "dump raw trace in ASCII"),
        OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
+       OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
+                  "file", "kallsyms pathname"),
        OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
                    "load module symbols - WARNING: use only with -k and LIVE 
kernel"),
        OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
-- 
1.9.3

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