[4.2-stable only] Revert "perf test: Ignore kcore files in the "vmlinux matches kallsyms" test"

BugLink: http://bugs.launchpad.net/bugs/1592552

This reverts commit 159436d273a248e99f05dcd15f39e2c6bdb02652.

Causes an FTBS.

tests/vmlinux-kallsyms.c: In function 'test__vmlinux_matches_kallsyms':
tests/vmlinux-kallsyms.c:64:6: error: implicit declaration of function '__machine__load_kallsyms' [-Werror=implicit-function-declaration]
  if (__machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, true, NULL) <= 0) {
      ^
tests/vmlinux-kallsyms.c:64:2: error: nested extern declaration of '__machine__load_kallsyms' [-Werror=nested-externs]
  if (__machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, true, NULL) <= 0) {
  ^
cc1: all warnings being treated as errors
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

tools/perf/tests/vmlinux-kallsyms.c

@@ -54,14 +54,8 @@ int test__vmlinux_matches_kallsyms(void)
 	 * Step 3:
 	 *
 	 * Load and split /proc/kallsyms into multiple maps, one per module.
-	 * Do not use kcore, as this test was designed before kcore support
-	 * and has parts that only make sense if using the non-kcore code.
-	 * XXX: extend it to stress the kcorre code as well, hint: the list
-	 * of modules extracted from /proc/kcore, in its current form, can't
-	 * be compacted against the list of modules found in the "vmlinux"
-	 * code and with the one got from /proc/modules from the "kallsyms" code.
 	 */
-	if (__machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, true, NULL) <= 0) {
+	if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
 		pr_debug("dso__load_kallsyms ");
 		goto out;
 	}