[tip: perf/core] perf llvm: Add debug hint message about missing kernel-devel package

[tip-bot2 for Arnaldo Carvalho de Melo]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     357a5d24c4715d454f8acd6796e2adaaef0c48ed
Gitweb:        https://git.kernel.org/tip/357a5d24c4715d454f8acd6796e2adaaef0c48ed
Author:        Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate:    Thu, 27 Feb 2020 11:43:53 -03:00
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Wed, 04 Mar 2020 10:34:10 -03:00

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@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/llvm-utils.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index b5af680..dbdffb6 100644
--- 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;
 }