diff -urNp ref/arch/um/config.in 2.4.20pre5aa1/arch/um/config.in
--- ref/arch/um/config.in	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/arch/um/config.in	Fri Aug 30 07:00:35 2002
@@ -8,8 +8,6 @@ define_bool CONFIG_PCI n
 
 define_bool CONFIG_UID16 y
 
-define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM y
-
 mainmenu_option next_comment
 comment 'Code maturity level options'
 bool 'Prompt for development and/or incomplete code/drivers' CONFIG_EXPERIMENTAL
@@ -21,6 +19,8 @@ bool 'Networking support' CONFIG_NET
 bool 'System V IPC' CONFIG_SYSVIPC
 bool 'BSD Process Accounting' CONFIG_BSD_PROCESS_ACCT
 bool 'Sysctl support' CONFIG_SYSCTL
+int 'Maximum User Real-Time Priority' CONFIG_MAX_USER_RT_PRIO 100
+int 'Maximum Kernel Real-time Priority' CONFIG_MAX_RT_PRIO 0
 tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
 tristate 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
 tristate 'Kernel support for MISC binaries' CONFIG_BINFMT_MISC
diff -urNp ref/arch/um/include/2_5compat.h 2.4.20pre5aa1/arch/um/include/2_5compat.h
--- ref/arch/um/include/2_5compat.h	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/arch/um/include/2_5compat.h	Fri Aug 30 07:00:35 2002
@@ -36,12 +36,9 @@
 #define IS_WRITE(req) ((req)->cmd == WRITE)
 #define IS_READ(req) ((req)->cmd == READ)
 
-#define CPU(task) ((task)->processor)
+#define CPU(task) ((task)->cpu)
 
-#define yield() do { current->policy |= SCHED_YIELD; schedule(); } while(0)
-
-#define SET_PRI(task) \
-	do { (task)->nice = 20; (task)->counter = -100; } while(0);
+#define SET_PRI(task) do { } while(0)
 
 #else
 
diff -urNp ref/arch/um/kernel/time.c 2.4.20pre5aa1/arch/um/kernel/time.c
--- ref/arch/um/kernel/time.c	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/arch/um/kernel/time.c	Fri Aug 30 07:00:35 2002
@@ -15,7 +15,7 @@
 #include "process.h"
 #include "signal_user.h"
 
-extern struct timeval xtime;
+extern volatile struct timeval xtime;
 
 void timer_handler(int sig, struct uml_pt_regs *regs)
 {
diff -urNp ref/arch/um/kernel/trap_kern.c 2.4.20pre5aa1/arch/um/kernel/trap_kern.c
--- ref/arch/um/kernel/trap_kern.c	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/arch/um/kernel/trap_kern.c	Fri Aug 30 07:00:35 2002
@@ -48,7 +48,7 @@ unsigned long segv(unsigned long address
 	if(!vma) goto bad;
 	else if(vma->vm_start <= address) goto good_area;
 	else if(!(vma->vm_flags & VM_GROWSDOWN)) goto bad;
-	else if(expand_stack(vma, address)) goto bad;
+	else if(expand_stack(vma, address, NULL)) goto bad;
 
  good_area:
 	si.si_code = SEGV_ACCERR;
diff -urNp ref/include/asm-um/page.h 2.4.20pre5aa1/include/asm-um/page.h
--- ref/include/asm-um/page.h	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/include/asm-um/page.h	Fri Aug 30 07:00:35 2002
@@ -46,4 +46,7 @@ extern struct page *page_mem_map(struct 
 extern struct page *arch_validate(struct page *page, int mask, int order);
 #define HAVE_ARCH_VALIDATE
 
+#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
+				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
 #endif
diff -urNp ref/include/asm-um/rwsem.h 2.4.20pre5aa1/include/asm-um/rwsem.h
--- ref/include/asm-um/rwsem.h	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/include/asm-um/rwsem.h	Thu Jan  1 01:00:00 1970
@@ -1,10 +0,0 @@
-#ifndef __UM_RWSEM_H__
-#define __UM_RWSEM_H__
-
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
-#define __builtin_expect(exp,c) (exp)
-#endif
-
-#include "asm/arch/rwsem.h"
-
-#endif
diff -urNp ref/include/asm-um/rwsem_xchgadd.h 2.4.20pre5aa1/include/asm-um/rwsem_xchgadd.h
--- ref/include/asm-um/rwsem_xchgadd.h	Thu Jan  1 01:00:00 1970
+++ 2.4.20pre5aa1/include/asm-um/rwsem_xchgadd.h	Fri Aug 30 07:00:35 2002
@@ -0,0 +1,6 @@
+#ifndef __UM_RWSEM_H__
+#define __UM_RWSEM_H__
+
+#include "asm/arch/rwsem_xchgadd.h"
+
+#endif
diff -urNp ref/include/asm-um/smp.h 2.4.20pre5aa1/include/asm-um/smp.h
--- ref/include/asm-um/smp.h	Fri Aug 30 07:00:33 2002
+++ 2.4.20pre5aa1/include/asm-um/smp.h	Fri Aug 30 07:00:35 2002
@@ -6,7 +6,7 @@
 #include "linux/config.h"
 #include "asm/current.h"
 
-#define smp_processor_id() (current->processor)
+#define smp_processor_id() (current->cpu)
 #define cpu_logical_map(n) (n)
 #define cpu_number_map(n) (n)
 #define PROC_CHANGE_PENALTY	15 /* Pick a number, any number */