Re: 2.6.0-test7 DEBUG_PAGEALLOC oops

[Manfred Spraul]

Could you try the attached patch?
It updates the end of stack detection to handle unaligned stacks.

--
   Manfred
// $Header$
// Kernel Version:
//  VERSION = 2
//  PATCHLEVEL = 6
//  SUBLEVEL = 0
//  EXTRAVERSION = -test7
--- 2.6/include/asm-i386/thread_info.h	2003-10-09 21:20:00.000000000 +0200
+++ build-2.6/include/asm-i386/thread_info.h	2003-10-12 08:50:12.000000000 +0200
@@ -101,6 +101,16 @@
 
 #endif
 
+static inline int kstack_end(void *addr)
+{
+	unsigned long offset = (unsigned long)addr & (THREAD_SIZE-1);
+
+	/* Some APM bios versions misalign the stack */
+	if (offset == 0 || offset > (THREAD_SIZE-sizeof(void*)))
+			return 1;
+	return 0;
+}
+
 /*
  * thread information flags
  * - these are process state flags that various assembly files may need to access
--- 2.6/mm/slab.c	2003-10-09 21:23:19.000000000 +0200
+++ build-2.6/mm/slab.c	2003-10-12 08:51:13.000000000 +0200
@@ -862,7 +862,7 @@
 		unsigned long *sptr = &caller;
 		unsigned long svalue;
 
-		while (((long) sptr & (THREAD_SIZE-1)) != 0) {
+		while (!kstack_end(sptr)) {
 			svalue = *sptr++;
 			if (kernel_text_address(svalue)) {
 				*addr++=svalue;
--- 2.6/arch/i386/kernel/traps.c	2003-10-09 21:23:03.000000000 +0200
+++ build-2.6/arch/i386/kernel/traps.c	2003-10-12 08:50:41.000000000 +0200
@@ -104,7 +104,7 @@
 #ifdef CONFIG_KALLSYMS
 	printk("\n");
 #endif
-	while (((long) stack & (THREAD_SIZE-1)) != 0) {
+	while (!kstack_end(stack)) {
 		addr = *stack++;
 		if (kernel_text_address(addr)) {
 			printk(" [<%08lx>] ", addr);
@@ -138,7 +138,7 @@
 
 	stack = esp;
 	for(i = 0; i < kstack_depth_to_print; i++) {
-		if (((long) stack & (THREAD_SIZE-1)) == 0)
+		if (kstack_end(stack))
 			break;
 		if (i && ((i % 8) == 0))
 			printk("\n       ");