linux-perf: Fix reading of build-id from vDSO

debian/changelog

@@ -2,6 +2,9 @@ linux-tools (4.4-1~exp1) UNRELEASED; urgency=medium
 
   * New upstream release
 
+  [ Ben Hutchings ]
+  * linux-perf: Fix reading of build-id from vDSO
+
  -- Ben Hutchings <ben@decadent.org.uk>  Tue, 19 Jan 2016 00:04:27 +0000
 
 linux-tools (4.4~rc4-1~exp1) experimental; urgency=medium

debian/patches/perf-tools-fix-reading-of-build-id-from-vdso.patch

@@ -0,0 +1,26 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Wed, 13 Jan 2016 15:16:30 +0000
+Subject: perf tools: Fix reading of build-id from vDSO
+Forwarded: http://mid.gmane.org/20160113172301.GT28542@decadent.org.uk
+
+We need to use the long name (the filename) when reading the build-id
+from a DSO.  Using the short name doesn't work for (at least) vDSOs.
+
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+ tools/perf/util/symbol.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
+index cd08027..b60bc49 100644
+--- a/tools/perf/util/symbol.c
++++ b/tools/perf/util/symbol.c
+@@ -1465,7 +1465,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
+ 	 * Read the build id if possible. This is required for
+ 	 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
+ 	 */
+-	if (filename__read_build_id(dso->name, build_id, BUILD_ID_SIZE) > 0)
++	if (filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0)
+ 		dso__set_build_id(dso, build_id);
+ 
+ 	/*

debian/patches/series

@@ -15,3 +15,4 @@ tools-hv-fix-fortify-format-warning.patch
 revert-perf-build-fix-libunwind-feature-detection-on.patch
 alpha-uapi-add-support-for-__sane_userspace_types__.patch
 nvme-stop-installing-kernel-only-linux-nvme.h-as-uap.patch
+perf-tools-fix-reading-of-build-id-from-vdso.patch