From e8a587ea7b53ad9a7e66d76e5142afd4d7173587 Mon Sep 17 00:00:00 2001
From: Berkus Decker <berkus+github@metta.systems>
Date: Fri, 11 Aug 2023 17:22:16 +0300
Subject: [PATCH] =?UTF-8?q?fix:=20=F0=9F=90=9B=20Don't=20overflow=20calcul?=
 =?UTF-8?q?ations=20in=20align=5Fup?=
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---
 machine/src/mm/mod.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/machine/src/mm/mod.rs b/machine/src/mm/mod.rs
index 796b1f7..a1e232d 100644
--- a/machine/src/mm/mod.rs
+++ b/machine/src/mm/mod.rs
@@ -30,7 +30,12 @@ pub const fn align_up(value: usize, alignment: usize) -> usize {
         "`alignment` must be a power of two"
     );
 
-    (value + alignment - 1) & !(alignment - 1)
+    let align_mask = alignment - 1;
+    if value & align_mask == 0 {
+        value // already aligned
+    } else {
+        (value | align_mask) + 1
+    }
 }
 
 /// Check if a value is aligned to a given alignment.