BTF mismatch can occur for a separately-built module even when the ABI
is otherwise compatible and nothing else would prevent successfully
loading. Add a new config to control how mismatches are handled. By
default, preserve the current behavior of refusing to load the
module. If MODULE_ALLOW_BTF_MISMATCH is enabled, load the module but
ignore its BTF information.
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
Required to run BPF CO-RE applications.
+config KERNEL_MODULE_ALLOW_BTF_MISMATCH
+ bool "Allow loading modules with non-matching BTF type info"
+ depends on KERNEL_DEBUG_INFO_BTF
+ help
+ For modules whose split BTF does not match vmlinux, load without
+ BTF rather than refusing to load. The default behavior with
+ module BTF enabled is to reject modules with such mismatches;
+ this option will still load module BTF where possible but ignore
+ it when a mismatch is found.
+
config KERNEL_DEBUG_INFO_REDUCED
bool "Reduce debugging information"
default y