From 72ec2fae6ef6d577ea030f77a769cc147e8a983e Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Wed, 18 Dec 2019 20:48:58 +0100
Subject: [PATCH] Kernel: Ignore MADV_SET_NONVOLATILE if already non-volatile

Just return 0 right away without changing any region flags.
---
 Kernel/Process.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 659b9556d0..700e1bd954 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -358,6 +358,8 @@ int Process::sys$madvise(void* address, size_t size, int advice)
         if (!region->vmobject().is_purgeable())
             return -EPERM;
         auto& vmobject = static_cast<PurgeableVMObject&>(region->vmobject());
+        if (!vmobject.is_volatile())
+            return 0;
         vmobject.set_volatile(false);
         bool was_purged = vmobject.was_purged();
         vmobject.set_was_purged(false);