build: remove -Wno-implicit-function-declaration

kernel/Makefile

@@ -159,7 +159,7 @@ ifeq ($(shell grep -q "struct proc_ops " $(srctree)/include/linux/proc_fs.h; ech
 ccflags-y += -DKSU_COMPAT_HAS_PROC_OPS
 endif
 
-ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat -Wno-missing-prototypes
+ccflags-y += -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat -Wno-missing-prototypes
 ccflags-y += -Wno-declaration-after-statement -Wno-unused-function -Wno-unused-variable
 
 all:

kernel/core_hook.c

@@ -389,6 +389,7 @@ void escape_to_root_for_cmd_su(uid_t target_uid, pid_t target_pid)
 
 
 #ifdef CONFIG_EXT4_FS
+extern void ext4_unregister_sysfs(struct super_block *sb);
 void nuke_ext4_sysfs(void) 
 {
     struct path path;
@@ -453,7 +454,7 @@ static bool should_umount(struct path *path)
     }
     return false;
 }
-
+extern int path_umount(struct path *path, int flags);
 static void ksu_umount_mnt(struct path *path, int flags)
 {
     int err = path_umount(path, flags);

kernel/ksu.c

@@ -64,6 +64,7 @@ int __init kernelsu_init(void)
     return 0;
 }
 
+extern void ksu_observer_exit(void);
 void kernelsu_exit(void)
 {
     ksu_allowlist_exit();

kernel/manager.h

@@ -40,6 +40,4 @@ static inline void ksu_invalidate_manager_uid(void)
 }
 
 int ksu_observer_init(void);
-void ksu_observer_exit(void);
-
 #endif

kernel/selinux/Makefile

@@ -10,7 +10,7 @@ ifeq ($(shell grep -q "struct selinux_state " $(srctree)/security/selinux/includ
 ccflags-y += -DKSU_COMPAT_HAS_SELINUX_STATE
 endif
 
-ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion
+ccflags-y += -Wno-strict-prototypes -Wno-int-conversion
 ccflags-y += -Wno-declaration-after-statement -Wno-unused-function
 ccflags-y += -I$(srctree)/security/selinux -I$(srctree)/security/selinux/include
 ccflags-y += -I$(objtree)/security/selinux -include $(srctree)/include/uapi/asm-generic/errno.h

kernel/selinux/rules.c

@@ -201,7 +201,11 @@ static int get_object(char *buf, char __user *user_object, size_t buf_sz,
 
     return 0;
 }
-
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(6, 4, 0))
+extern int avc_ss_reset(u32 seqno);
+#else
+extern int avc_ss_reset(struct selinux_avc *avc, u32 seqno);
+#endif
 // reset avc cache table, otherwise the new rules will not take effect if already denied
 static void reset_avc_cache()
 {

kernel/throne_tracker.c

@@ -234,7 +234,7 @@ struct my_dir_context {
 #define FILLDIR_ACTOR_CONTINUE 0
 #define FILLDIR_ACTOR_STOP -EINVAL
 #endif
-
+extern bool is_manager_apk(char *path);
 FILLDIR_RETURN_TYPE my_actor(struct dir_context *ctx, const char *name,
                  int namelen, loff_t off, u64 ino,
                  unsigned int d_type)