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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 1af62ce6
...@@ -265,6 +265,8 @@ static int detect_kbuild_dir(char **kbuild_dir) ...@@ -265,6 +265,8 @@ static int detect_kbuild_dir(char **kbuild_dir)
return -ENOMEM; return -ENOMEM;
return 0; return 0;
} }
pr_debug("%s: Couldn't find \"%s\", missing kernel-devel package?.\n",
__func__, autoconf_path);
free(autoconf_path); free(autoconf_path);
return -ENOENT; return -ENOENT;
} }
......
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