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[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>
This commit is contained in:
Rusty Russell 2007-05-02 19:27:09 +02:00 committed by Andi Kleen
parent 1b523fb549
commit 692174b97d
1 changed files with 1 additions and 0 deletions
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1
include/asm-i386/processor.h
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@ -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, \