From efe70b3b3e8bd4e1d5701688eadd3491a4196e4a Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Tue, 12 Mar 2013 21:29:19 +0100
Subject: [PATCH] Avoid physical frame stack overflow.

---
 sortix/x86-family/memorymanagement.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/sortix/x86-family/memorymanagement.cpp b/sortix/x86-family/memorymanagement.cpp
index 4f39a8d2..8fcef292 100644
--- a/sortix/x86-family/memorymanagement.cpp
+++ b/sortix/x86-family/memorymanagement.cpp
@@ -239,7 +239,7 @@ namespace Sortix
 		{
 			// This call will always succeed, if it didn't, then the stack
 			// wouldn't be full, and thus this function won't be called.
-			addr_t page = Get();
+			addr_t page = GetUnlocked();
 
 			// This call will also succeed, since there are plenty of physical
 			// pages available and it might need some.
@@ -350,7 +350,15 @@ namespace Sortix
 		void PutUnlocked(addr_t page)
 		{
 			assert(page == AlignDown(page));
-			assert(stackused < MAXSTACKLENGTH);
+			if ( unlikely(stackused == stacklength) )
+			{
+				if ( stackused == MAXSTACKLENGTH )
+				{
+					pagesnotonstack++;
+					return;
+				}
+				ExtendStack();
+			}
 			STACK[stackused++] = page;
 		}