build: Replace manual division with div_ceil

Signed-off-by: Akira Moroo <[email protected]>

Author: retrage

src/efi/alloc.rs

@@ -42,7 +42,7 @@ impl Allocator {
     }
 
     pub fn page_count(&self, size: usize) -> u64 {
-        ((size + self.page_size as usize - 1) / self.page_size as usize) as u64
+        size.div_ceil(self.page_size as usize) as u64
     }
 
     // Assume called in order with non-overlapping sections.
@@ -338,7 +338,7 @@ impl Allocator {
     }
 
     pub fn allocate_pool(&mut self, memory_type: MemoryType, size: usize) -> (Status, u64) {
-        let page_count = (size as u64 + self.page_size - 1) / self.page_size;
+        let page_count = (size as u64).div_ceil(self.page_size);
         let (status, address) =
             self.allocate_pages(efi::ALLOCATE_ANY_PAGES, memory_type, page_count, 0);
 

src/fat.rs

@@ -665,8 +665,7 @@ impl<'a> Filesystem<'a> {
         self.bytes_per_sector = u32::from(h.bytes_per_sector);
         self.fat_count = u32::from(h.fat_count);
         self.sectors_per_cluster = u32::from(h.sectors_per_cluster);
-        self.root_dir_sectors = ((u32::from(h.root_dir_count * 32)) + self.bytes_per_sector - 1)
-            / self.bytes_per_sector;
+        self.root_dir_sectors = (u32::from(h.root_dir_count * 32)).div_ceil(self.bytes_per_sector);
 
         self.sectors_per_fat = if h.legacy_sectors_per_fat == 0 {
             let h32 = unsafe { &*(data.as_bytes().as_ptr() as *const Fat32Header) };

src/pci.rs

@@ -176,7 +176,7 @@ where
 }
 
 fn naturally_align(address: u64, size: u64) -> u64 {
-    ((address + size - 1) / size) * size
+    address.div_ceil(size) * size
 }
 
 #[derive(Default)]