diff --git a/kernel/Makefile b/kernel/Makefile
index 7622754c..4b1f9181 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -153,6 +153,11 @@ ifeq ($(shell grep -q "struct proc_ops " $(srctree)/include/linux/proc_fs.h; ech
 ccflags-y += -DKSU_COMPAT_HAS_PROC_OPS
 endif
 
+# Struct selinux_state check
+ifeq ($(shell grep -q "struct selinux_state " $(srctree)/security/selinux/include/security.h; echo $$?),0)
+ccflags-y += -DKSU_COMPAT_HAS_SELINUX_STATE
+endif
+
 # Custom Signs
 ifdef KSU_EXPECTED_SIZE
 ccflags-y += -DEXPECTED_SIZE=$(KSU_EXPECTED_SIZE)
diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index d47e3e37..25fa46e0 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -1063,7 +1063,11 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
                 if (!is_ksu_domain()) {
                     pr_warn("find suspicious EoP: %d %s, from %d to %d\n", 
                         current->pid, current->comm, old_uid.val, new_uid.val);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
                     force_sig(SIGKILL);
+#else
+                    force_sig(SIGKILL, current);
+#endif
                     return 0;
                 }
             }
@@ -1072,7 +1076,11 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
                 if (new_uid.val < old_uid.val && !ksu_is_allow_uid_for_current(old_uid.val)) {
                     pr_warn("find suspicious EoP: %d %s, from %d to %d\n", 
                         current->pid, current->comm, old_uid.val, new_uid.val);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
                     force_sig(SIGKILL);
+#else
+                    force_sig(SIGKILL, current);
+#endif
                     return 0;
                 }
             }
@@ -1239,7 +1247,11 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
                 if (!is_ksu_domain()) {
                     pr_warn("find suspicious EoP: %d %s, from %d to %d\n", 
                         current->pid, current->comm, old_uid.val, new_uid.val);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
                     force_sig(SIGKILL);
+#else
+                    force_sig(SIGKILL, current);
+#endif
                     return 0;
                 }
             }
@@ -1248,7 +1260,11 @@ int ksu_handle_setuid(struct cred *new, const struct cred *old)
                 if (new_uid.val < old_uid.val && !ksu_is_allow_uid_for_current(old_uid.val)) {
                     pr_warn("find suspicious EoP: %d %s, from %d to %d\n", 
                         current->pid, current->comm, old_uid.val, new_uid.val);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
                     force_sig(SIGKILL);
+#else
+                    force_sig(SIGKILL, current);
+#endif
                     return 0;
                 }
             }
diff --git a/kernel/file_proxy.c b/kernel/file_proxy.c
index ba128e19..5829c769 100644
--- a/kernel/file_proxy.c
+++ b/kernel/file_proxy.c
@@ -278,7 +278,7 @@ static int ksu_file_proxy_fadvise(struct file *fp, loff_t off1, loff_t off2, int
 static int ksu_wrapper_clone_file_range(struct file *file_in, loff_t pos_in,
 				struct file *file_out, loff_t pos_out, u64 len) {
 	// TODO: determine which file to use
-	struct ksu_file_wrapper* data = file_in->private_data;
+	struct ksu_file_proxy* data = file_in->private_data;
 	struct file* orig = data->orig;
 	if (orig->f_op->clone_file_range) {
 		return orig->f_op->clone_file_range(orig, pos_in, file_out, pos_out, len);
@@ -289,7 +289,7 @@ static int ksu_wrapper_clone_file_range(struct file *file_in, loff_t pos_in,
 static ssize_t ksu_wrapper_dedupe_file_range(struct file *src_file, u64 loff,
 				u64 len, struct file *dst_file, u64 dst_loff) {
 	// TODO: determine which file to use
-	struct ksu_file_wrapper* data = src_file->private_data;
+	struct ksu_file_proxy* data = src_file->private_data;
 	struct file* orig = data->orig;
 	if (orig->f_op->dedupe_file_range) {
 		return orig->f_op->dedupe_file_range(orig, loff, len, dst_file, dst_loff);
diff --git a/kernel/selinux/selinux.h b/kernel/selinux/selinux.h
index de176989..1cafd579 100644
--- a/kernel/selinux/selinux.h
+++ b/kernel/selinux/selinux.h
@@ -5,7 +5,7 @@
 #include <linux/version.h>
 #include "linux/sched.h"
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)) || defined(KSU_COMPAT_HAS_SELINUX_STATE)
+#ifdef KSU_COMPAT_HAS_SELINUX_STATE
 #define KSU_COMPAT_USE_SELINUX_STATE
 #endif