perf symbols: Support to read compressed module from build-id cache

The commit c00c48fc6e6e ("perf symbols: Preparation for compressed
kernel module support") added support for compressed kernel modules but
it only supports system path DSOs.  When a dso is read from build-id
cache, its filename doesn't end with ".gz" but has build-id.  In this
case, we should fallback to the original dso->name.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1422518843-25818-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 06fcd1bf98b6..b24f9d8727a8 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -574,13 +574,16 @@ static int decompress_kmodule(struct dso *dso, const char *name,
         const char *ext = strrchr(name, '.');
         char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
 
-        if ((type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
-             type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP) ||
-            type != dso->symtab_type)
+        if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
+            type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
+            type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
                 return -1;
 
-        if (!ext || !is_supported_compression(ext + 1))
-                return -1;
+        if (!ext || !is_supported_compression(ext + 1)) {
+                ext = strrchr(dso->name, '.');
+                if (!ext || !is_supported_compression(ext + 1))
+                        return -1;
+        }
 
         fd = mkstemp(tmpbuf);
         if (fd < 0)