The files in this directory are copied from current kernel master (b06ed1e7a2fa9b636f368a9e97c3c8877623f8b2) or WireGuard master (8416093498ac2c754536dad4757c5d86c9ba8809), and the following modifications are applied: - btrfs.h: drop '__user' attributes - if.h: drop '#include <linux/compiler.h>' and '__user' attributes - stddef.h: drop '#include <linux/compiler_types.h>' - guard linux/fs.h include to avoid conflict with glibc 2.36