fix build

Signed-off-by: Andy-Python-Programmer <[email protected]>

Author: Andy-Python-Programmer

src/aero_kernel/src/syscall/mod.rs

@@ -211,7 +211,6 @@ pub fn generic_do_syscall(
 
     #[cfg(feature = "syslog")]
     {
-        use crate::drivers::uart_16550;
         use alloc::string::String;
 
         let name = aero_syscall::syscall_as_str(a);
@@ -242,7 +241,7 @@ pub fn generic_do_syscall(
         let result_str = alloc::format!("{:?}", result);
         result_v.push_str(&result_str);
 
-        uart_16550::serial_println!("{}", result_v);
+        log::trace!("{}", result_v);
     }
 
     result_usize

src/aero_kernel/src/syscall/process.rs

@@ -145,7 +145,7 @@ pub fn waitpid(pid: usize, status: usize, _flags: usize) -> Result<usize, AeroSy
     let current_task = scheduler::get_scheduler().current_task();
     let status = unsafe { &mut *(status as *mut u32) };
 
-    Ok(current_task.waitpid(pid, status)?)
+    Ok(current_task.waitpid(pid as isize, status)?)
 }
 
 pub fn mmap(