Make kernel stack dumps handle unaligned kernel stacks more gracefully.

They can happen on x86 as a result of interrupts in BIOS calls.

Noted by Manfred Spraul.

arch/i386/kernel/traps.c

@@ -104,7 +104,7 @@ void show_trace(struct task_struct *task, unsigned long * stack)
 #ifdef CONFIG_KALLSYMS
 	printk("\n");
 #endif
-	while (((long) stack & (THREAD_SIZE-1)) != 0) {
+	while (((long) stack & (THREAD_SIZE-4)) != 0) {
 		addr = *stack++;
 		if (kernel_text_address(addr)) {
 			printk(" [<%08lx>] ", addr);
@@ -138,7 +138,7 @@ void show_stack(struct task_struct *task, unsigned long *esp)
 
 	stack = esp;
 	for(i = 0; i < kstack_depth_to_print; i++) {
-		if (((long) stack & (THREAD_SIZE-1)) == 0)
+		if (((long) stack & (THREAD_SIZE-4)) == 0)
 			break;
 		if (i && ((i % 8) == 0))
 			printk("\n       ");

mm/slab.c

@@ -862,7 +862,7 @@ static void store_stackinfo(kmem_cache_t *cachep, unsigned long *addr, unsigned
 		unsigned long *sptr = &caller;
 		unsigned long svalue;
 
-		while (((long) sptr & (THREAD_SIZE-1)) != 0) {
+		while (((long) sptr & (THREAD_SIZE-4)) != 0) {
 			svalue = *sptr++;
 			if (kernel_text_address(svalue)) {
 				*addr++=svalue;