implicit declaration and serial warnings in sched.c

Author: PythonPlumber

src/drivers/keyboard.c

@@ -1,6 +1,7 @@
 #include "types.h"
 #include "drivers/keyboard.h"
 #include "arch/x86/interrupts.h"
+#include "arch/x86/ports.h"
 
 #define KEYBOARD_BUFFER_SIZE 128
 

src/kernel.c

@@ -63,7 +63,7 @@ static uint32_t align_up(uint32_t value, uint32_t align) {
     return (value + align - 1) & ~(align - 1);
 }
 
-static uint32_t align_down(uint32_t value, uint32_t align) {
+static uint32_t __attribute__((unused)) align_down(uint32_t value, uint32_t align) {
     return value & ~(align - 1);
 }
 

src/kernel/sched.c

@@ -8,6 +8,7 @@
 #include "mem/vm_space.h"
 #include "mem/heap.h"
 #include "util.h"
+#include "drivers/serial.h"
 #include "user/elf_loader.h"
 #include "cpu.h"
 
@@ -37,6 +38,8 @@ static process_t* current_process[MAX_CPUS];
 static uint32_t default_priority = 10;
 static uint32_t default_time_slice = 4;
 
+static process_t* scheduler_pick_best_ready(void);
+
 process_t* scheduler_current(void) {
     return current_process[cpu_get_id()];
 }