perf kvm: Make perf kvm diff support --guestmount.

In manpage of perf-kvm, --guestmount is supported by diff command, but
it does not work well.

This patch change the extend the checking in buildid-diff from
guestkallsyms or guestmodules to perf_guest. Then this checking can
cover the all cases perf kvm is used for.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Link: http://lkml.kernel.org/r/72857ed89642e0633f5e88f7e7abbc9645359e8e.1386368672.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 3b67ea2444bd4abf8314ef5c40c7d4b3e731c455..2a85cc9a2d097828e4b9aff3a958a2021d402b16 100644 (file)
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -1000,8 +1000,7 @@ static int data_init(int argc, const char **argv)
                        data__files_cnt = argc;
                        use_default = false;
                }
-       } else if (symbol_conf.default_guest_vmlinux_name ||
-                  symbol_conf.default_guest_kallsyms) {
+       } else if (perf_guest) {
                defaults[0] = "perf.data.host";
                defaults[1] = "perf.data.guest";
        }