From 692174b97d5b871f4b0f648b1fb17aa37b955876 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 2 May 2007 19:27:09 +0200
Subject: [PATCH] [PATCH] i386: Initialize esp0 properly all the time
Whenever we schedule, __switch_to calls load_esp0 which does:
tss->esp0 = thread->esp0;
This is never initialized for the initial thread (ie "swapper"), so when we're
scheduling that, we end up setting esp0 to 0. This is fine: the swapper never
leaves ring 0, so this field is never used.
lguest, however, gets upset that we're trying to used an unmapped page as our
kernel stack. Rather than work around it there, let's initialize it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/asm-i386/processor.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 11bf899de8aa..01ae0ffcf236 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -421,6 +421,7 @@ struct thread_struct {
};
#define INIT_THREAD { \
+ .esp0 = sizeof(init_stack) + (long)&init_stack, \
.vm86_info = NULL, \
.sysenter_cs = __KERNEL_CS, \
.io_bitmap_ptr = NULL, \