diff --git a/fs/epfs/Kconfig b/fs/epfs/Kconfig
index 059c3a0cc10d40f8cc99efd7bf39f1b9ea771615..6a631dba7ad89dcc7666c96d6b4509f859c46372 100644
--- a/fs/epfs/Kconfig
+++ b/fs/epfs/Kconfig
@@ -1,12 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0
 config EPFS
-	tristate "Enhanced Proxy File System support"
+	bool "Enhanced Proxy File System support"
 	depends on TMPFS
 	help
 	  Enhanced Proxy File System support. If unsure, say N.
 
 config EPFS_DEBUG
-	tristate "Debug message of Enhanced Proxy File System"
+	bool "Debug message of Enhanced Proxy File System"
 	depends on EPFS
 	help
 	  Enhanced Proxy File System debug support.
diff --git a/fs/epfs/file.c b/fs/epfs/file.c
index 5b236150f8b40ed129fcaf9123825f9b80b4fe0c..430cb26737f6efa9fea206582458958959637238 100644
--- a/fs/epfs/file.c
+++ b/fs/epfs/file.c
@@ -236,7 +236,7 @@ static ssize_t epfs_read(struct file *file, char __user *buf, size_t count,
 			// read directly when epfs range gone;
 			if (IS_ENABLED(CONFIG_EPFS_DEBUG))
 				epfs_debug(
-					"read from %llu with len %lu at the end.",
+					"read from %llu with len %zu at the end.",
 					pos, count);
 			ret = vfs_read(origin_file, buf, count, &pos);
 			break;
diff --git a/fs/epfs/super.c b/fs/epfs/super.c
index 4d708f855d1fb14185ce242f1d2a54e7326687e7..7368af775c8d77fc091a157d3c4df19bd22de2ce 100644
--- a/fs/epfs/super.c
+++ b/fs/epfs/super.c
@@ -79,7 +79,7 @@ static int epfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 struct super_operations epfs_sops = {
 	.alloc_inode = epfs_alloc_inode,
 	.destroy_inode = epfs_destroy_inode,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
 	.free_inode = epfs_free_inode,
 #endif
 	.evict_inode = epfs_evict_inode,