perf llvm: Add debug hint message about missing kernel-devel package

To help in debugging, add this extra message:

  detect_kbuild_dir: Couldn't find "/lib/modules/5.4.20-200.fc31.x86_64/build/include/generated/autoconf.h", missing kernel-devel package?.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index b5af680..dbdffb6 100644 (file)
--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -265,6 +265,8 @@ static int detect_kbuild_dir(char **kbuild_dir)
                        return -ENOMEM;
                return 0;
        }
+       pr_debug("%s: Couldn't find \"%s\", missing kernel-devel package?.\n",
+                __func__, autoconf_path);
        free(autoconf_path);
        return -ENOENT;
 }