From 297c0748f0122b97e4d0fa6625a2d99167d020da Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 25 Jul 2021 02:11:32 +0200
Subject: [PATCH] Kernel: Minor cleanup around purge() during physical page
 allocation

---
 Kernel/VM/MemoryManager.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Kernel/VM/MemoryManager.cpp b/Kernel/VM/MemoryManager.cpp
index 36693404e8..182e5dc923 100644
--- a/Kernel/VM/MemoryManager.cpp
+++ b/Kernel/VM/MemoryManager.cpp
@@ -876,8 +876,10 @@ RefPtr<PhysicalPage> MemoryManager::allocate_user_physical_page(ShouldZeroFill s
         for_each_vmobject([&](auto& vmobject) {
             if (!vmobject.is_anonymous())
                 return IterationDecision::Continue;
-            int purged_page_count = static_cast<AnonymousVMObject&>(vmobject).purge();
-            if (purged_page_count) {
+            auto& anonymous_vmobject = static_cast<AnonymousVMObject&>(vmobject);
+            if (!anonymous_vmobject.is_purgeable() || !anonymous_vmobject.is_volatile())
+                return IterationDecision::Continue;
+            if (auto purged_page_count = anonymous_vmobject.purge()) {
                 dbgln("MM: Purge saved the day! Purged {} pages from AnonymousVMObject", purged_page_count);
                 page = find_free_user_physical_page(false);
                 purged_pages = true;