From 708dc6b7d6c28447279025480885e3f608224694 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Gardou?= <jerome.gardou@reactos.org>
Date: Mon, 2 Aug 2021 17:06:35 +0200
Subject: [PATCH] [NTOS:MM] Do not zero-fill pages when not needed

---
 ntoskrnl/mm/ARM3/pagfault.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ntoskrnl/mm/ARM3/pagfault.c b/ntoskrnl/mm/ARM3/pagfault.c
index 8d1ce33c399..a5dd04560d3 100644
--- a/ntoskrnl/mm/ARM3/pagfault.c
+++ b/ntoskrnl/mm/ARM3/pagfault.c
@@ -674,6 +674,11 @@ MiResolveDemandZeroFault(IN PVOID Address,
             PageFrameNumber = MiRemoveAnyPage(Color);
             NeedZero = TRUE;
         }
+        else
+        {
+            /* Page guaranteed to be zero-filled */
+            NeedZero = FALSE;
+        }
     }
     else
     {
@@ -688,6 +693,8 @@ MiResolveDemandZeroFault(IN PVOID Address,
         {
             /* System wants a zero page, obtain one */
             PageFrameNumber = MiRemoveZeroPage(Color);
+            /* No need to zero-fill it */
+            NeedZero = FALSE;
         }
     }