bpf, kconfig: Fix DEBUG_INFO_BTF_MODULES Kconfig definition

Turns out that due to CONFIG_DEBUG_INFO_BTF_MODULES not having an
explicitly specified "menu item name" in Kconfig, it's basically
impossible to turn it off (see [0]).

This patch fixes the issue by defining menu name for
CONFIG_DEBUG_INFO_BTF_MODULES, which makes it actually adjustable
and independent of CONFIG_DEBUG_INFO_BTF, in the sense that one can
have DEBUG_INFO_BTF=y and DEBUG_INFO_BTF_MODULES=n.

We still keep it as defaulting to Y, of course.

Fixes: 5f9ae91f7c0d ("kbuild: Build kernel module BTFs if BTF is enabled and pahole supports it")
Reported-by: Vincent Li <vincent.mc.li@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/CAK3+h2xiFfzQ9UXf56nrRRP=p1+iUxGoEP5B+aq9MDT5jLXDSg@mail.gmail.com
Link: https://lore.kernel.org/bpf/20240404220344.3879270-1-andrii@kernel.org

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c63a5fbf1f1c2b45b67603886ef9e6f07510f61d..291185f54ee4c217d04b8040b339dc1ad47f9cf6 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -375,7 +375,7 @@ config DEBUG_INFO_SPLIT
          Incompatible with older versions of ccache.
 
 config DEBUG_INFO_BTF
-       bool "Generate BTF typeinfo"
+       bool "Generate BTF type information"
        depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
        depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
        depends on BPF_SYSCALL
@@ -408,7 +408,8 @@ config PAHOLE_HAS_LANG_EXCLUDE
          using DEBUG_INFO_BTF_MODULES.
 
 config DEBUG_INFO_BTF_MODULES
-       def_bool y
+       bool "Generate BTF type information for kernel modules"
+       default y
        depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF
        help
          Generate compact split BTF type information for kernel modules.