From f8c3cc345949d2b1f61cf7194e41cd81d170256d Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Wed, 11 Dec 2024 14:14:30 -0500
Subject: [PATCH] kernel/vm: Skip acquiring the available memory lock if
 there's nothing to unreserve.

This can happen when deleting VMCaches that were overcommitted or
never had any reservation, or caches that had their commitments
merged.
---
 src/system/kernel/vm/vm.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/system/kernel/vm/vm.cpp b/src/system/kernel/vm/vm.cpp
index 9a72f77c1e..6b8e2c7ff2 100644
--- a/src/system/kernel/vm/vm.cpp
+++ b/src/system/kernel/vm/vm.cpp
@@ -4697,10 +4697,11 @@ vm_kernel_address_space_left(void)
 void
 vm_unreserve_memory(size_t amount)
 {
+	if (amount == 0)
+		return;
+
 	mutex_lock(&sAvailableMemoryLock);
-
 	sAvailableMemory += amount;
-
 	mutex_unlock(&sAvailableMemoryLock);
 }