From 4de422ad69cdfa6eb658f3ef575ae7647f75103e Mon Sep 17 00:00:00 2001
From: Ruoqing He <heruoqing@iscas.ac.cn>
Date: Wed, 19 Feb 2025 16:00:59 +0800
Subject: [PATCH] misc: Fix clippy - manually reimplementing div_ceil

Reported by 1.86.0-beta.1 (f0cb41030 2025-02-17).

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>
---
 arch/src/x86_64/tdx/mod.rs    | 2 +-
 block/src/qcow/mod.rs         | 2 +-
 virtio-devices/src/balloon.rs | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/src/x86_64/tdx/mod.rs b/arch/src/x86_64/tdx/mod.rs
index aa74bea9f..dc21d1cc7 100644
--- a/arch/src/x86_64/tdx/mod.rs
+++ b/arch/src/x86_64/tdx/mod.rs
@@ -299,7 +299,7 @@ pub struct TdHob {
 }
 
 fn align_hob(v: u64) -> u64 {
-    (v + 7) / 8 * 8
+    v.div_ceil(8) * 8
 }
 
 impl TdHob {
diff --git a/block/src/qcow/mod.rs b/block/src/qcow/mod.rs
index 802b73066..4a6cb6c15 100644
--- a/block/src/qcow/mod.rs
+++ b/block/src/qcow/mod.rs
@@ -502,7 +502,7 @@ impl QcowFile {
         if refcount_bits != 16 {
             return Err(Error::UnsupportedRefcountOrder);
         }
-        let refcount_bytes = (refcount_bits + 7) / 8;
+        let refcount_bytes = refcount_bits.div_ceil(8);
 
         // Need at least one refcount cluster
         if header.refcount_table_clusters == 0 {
diff --git a/virtio-devices/src/balloon.rs b/virtio-devices/src/balloon.rs
index d9fa144cd..924475f0e 100644
--- a/virtio-devices/src/balloon.rs
+++ b/virtio-devices/src/balloon.rs
@@ -108,7 +108,7 @@ struct PartiallyBalloonedPage {
 impl PartiallyBalloonedPage {
     fn new() -> Self {
         let page_size = get_page_size();
-        let len = ((page_size >> VIRTIO_BALLOON_PFN_SHIFT) + 63) / 64;
+        let len = (page_size >> VIRTIO_BALLOON_PFN_SHIFT).div_ceil(64);
         // Initial each padding bit as 1 in bitmap.
         let mut bitmap = vec![0_u64; len as usize];
         let pad_num = len * 64 - (page_size >> VIRTIO_BALLOON_PFN_SHIFT);
@@ -134,7 +134,7 @@ impl PartiallyBalloonedPage {
     }
 
     fn reset(&mut self) {
-        let len = ((self.page_size >> VIRTIO_BALLOON_PFN_SHIFT) + 63) / 64;
+        let len = (self.page_size >> VIRTIO_BALLOON_PFN_SHIFT).div_ceil(64);
         self.addr = 0;
         self.bitmap = vec![0; len as usize];
         let pad_num = len * 64 - (self.page_size >> VIRTIO_BALLOON_PFN_SHIFT);