void parameter on functions of arity 0

src/mem/gdt/gdt.h

@@ -26,6 +26,6 @@ struct GDTR {
     uint64_t address;
 } __attribute__((packed));
 
-void gdt_init();
+void gdt_init(void);
 
 #endif

src/mem/heap/kheap.h

@@ -23,10 +23,10 @@ struct heap_block_t {
     struct heap_block_t* next;
 } __attribute__((aligned(16)));
 
-void kheap_init();
+void kheap_init(void);
 void* kmalloc(size_t size);
 void kfree(void* ptr);
-void* kalloc_stack();
-void kheap_map_page();
+void* kalloc_stack(void);
+void kheap_map_page(void);
 
 #endif

src/mem/paging/pmm.h

@@ -12,6 +12,6 @@
 
 void pmm_init(struct boot_context boot_ctx);
 void pmm_free(uintptr_t addr);
-uintptr_t pmm_alloc();
+uintptr_t pmm_alloc(void);
 
 #endif

src/mem/paging/vmm.h

@@ -29,6 +29,6 @@ struct vm_object {
 #define VM_FLAG_EXEC (1 << 1)
 #define VM_FLAG_USER (1 << 2)
 
-void vmm_init();
+void vmm_init(void);
 
 #endif