[PATCH 5.6 013/166] kbuild, btf: Fix dependencies for DEBUG_INFO_BTF

[Greg Kroah-Hartman]

From: Slava Bacherikov <slava@xxxxxxxxxxxx>

commit 7d32e69310d67e6b04af04f26193f79dfc2f05c7 upstream.

Currently turning on DEBUG_INFO_SPLIT when DEBUG_INFO_BTF is also
enabled will produce invalid btf file, since gen_btf function in
link-vmlinux.sh script doesn't handle *.dwo files.

Enabling DEBUG_INFO_REDUCED will also produce invalid btf file,
and using GCC_PLUGIN_RANDSTRUCT with BTF makes no sense.

Fixes: e83b9f55448a ("kbuild: add ability to generate BTF type info for vmlinux")
Reported-by: Jann Horn <jannh@xxxxxxxxxx>
Reported-by: Liu Yiding <liuyd.fnst@xxxxxxxxxxxxxx>
Signed-off-by: Slava Bacherikov <slava@xxxxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: KP Singh <kpsingh@xxxxxxxxxx>
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
Link: https://lore.kernel.org/bpf/20200402204138.408021-1-slava@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 lib/Kconfig.debug |    2 ++
 1 file changed, 2 insertions(+)

--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -241,6 +241,8 @@ config DEBUG_INFO_DWARF4
 config DEBUG_INFO_BTF
 	bool "Generate BTF typeinfo"
 	depends on DEBUG_INFO
+	depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
+	depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
 	help
 	  Generate deduplicated BTF type information from DWARF debug info.
 	  Turning this on expects presence of pahole tool, which will convert