diff --git a/loader/src/common/socket_utils.cpp b/loader/src/common/socket_utils.cpp
index 73dd1d24..d4a9f1d5 100644
--- a/loader/src/common/socket_utils.cpp
+++ b/loader/src/common/socket_utils.cpp
@@ -19,12 +19,12 @@ namespace socket_utils {
             read_sz += ret;
         } while (read_sz != count && ret != 0);
         if (read_sz != count) {
-            PLOGE("read (%d != %d)", count, read_sz);
+            PLOGE("read (%zu != %zu)", count, read_sz);
         }
         return read_sz;
     }
 
-    ssize_t xwrite(int fd, const void* buf, size_t count) {
+    size_t xwrite(int fd, const void* buf, size_t count) {
         size_t write_sz = 0;
         ssize_t ret;
         do {
@@ -32,12 +32,12 @@ namespace socket_utils {
             if (ret < 0) {
                 if (errno == EINTR) continue;
                 PLOGE("write");
-                return ret;
+                return write_sz;
             }
             write_sz += ret;
         } while (write_sz != count && ret != 0);
         if (write_sz != count) {
-            PLOGE("write (%d != %d)", count, write_sz);
+            PLOGE("write (%zu != %zu)", count, write_sz);
         }
         return write_sz;
     }
diff --git a/loader/src/include/socket_utils.h b/loader/src/include/socket_utils.h
index b2775d79..09330de9 100644
--- a/loader/src/include/socket_utils.h
+++ b/loader/src/include/socket_utils.h
@@ -9,7 +9,7 @@ namespace socket_utils {
 
     ssize_t xread(int fd, void *buf, size_t count);
 
-    ssize_t xwrite(int fd, const void *buf, size_t count);
+    size_t xwrite(int fd, const void *buf, size_t count);
 
     uint8_t read_u8(int fd);
 
diff --git a/zygiskd/src/root_impl/kernelsu.rs b/zygiskd/src/root_impl/kernelsu.rs
index e92163ca..d629b20e 100644
--- a/zygiskd/src/root_impl/kernelsu.rs
+++ b/zygiskd/src/root_impl/kernelsu.rs
@@ -23,10 +23,11 @@ pub fn get_kernel_su() -> Option<Version> {
             0,
         )
     };
+    const MAX_OLD_VERSION: i32 = MIN_KSU_VERSION - 1;
     match version {
         0 => None,
         MIN_KSU_VERSION..=MAX_KSU_VERSION => Some(Version::Supported),
-        1..=MIN_KSU_VERSION => Some(Version::TooOld),
+        1..=MAX_OLD_VERSION => Some(Version::TooOld),
         _ => Some(Version::Abnormal),
     }
 }
diff --git a/zygiskd/src/watchdog.rs b/zygiskd/src/watchdog.rs
index dff6532d..c0ef32aa 100644
--- a/zygiskd/src/watchdog.rs
+++ b/zygiskd/src/watchdog.rs
@@ -3,8 +3,8 @@ use anyhow::{bail, Result};
 use std::fs;
 use std::io::{BufRead, BufReader, Write};
 use std::time::Duration;
-use futures::{FutureExt, join, pin_mut};
-use futures::future::{Fuse, FusedFuture};
+use futures::{FutureExt, pin_mut};
+use futures::future::{Fuse};
 use log::{debug, error, info};
 use rustix::mount::mount_bind;
 use rustix::process::{getgid, getuid};