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authorH. Peter Anvin <hpa@linux.intel.com>2011-02-04 16:14:11 -0800
committerH. Peter Anvin <hpa@zytor.com>2011-02-04 22:27:28 -0800
commit11d4c3f9b671720e80353dd7e433ff2bf65e9500 (patch)
treeb3560b0642216e9c9e1a54e57a5f55845f063e6b /arch/x86/kernel/acpi/sleep.c
parentf7448548a9f32db38f243ccd4271617758ddfe2c (diff)
x86-32: Make sure the stack is set up before we use it
Since checkin ebba638ae723d8a8fc2f7abce5ec18b688b791d7 we call verify_cpu even in 32-bit mode. Unfortunately, calling a function means using the stack, and the stack pointer was not initialized in the 32-bit setup code! This code initializes the stack pointer, and simplifies the interface slightly since it is easier to rely on just a pointer value rather than a descriptor; we need to have different values for the segment register anyway. This retains start_stack as a virtual address, even though a physical address would be more convenient for 32 bits; the 64-bit code wants the other way around... Reported-by: Matthieu Castet <castet.matthieu@free.fr> LKML-Reference: <4D41E86D.8060205@free.fr> Tested-by: Kees Cook <kees.cook@canonical.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/acpi/sleep.c')
-rw-r--r--arch/x86/kernel/acpi/sleep.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 69fd72aa5594..4d9ebbab2230 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -100,7 +100,7 @@ int acpi_save_state_mem(void)
#else /* CONFIG_64BIT */
header->trampoline_segment = setup_trampoline() >> 4;
#ifdef CONFIG_SMP
- stack_start.sp = temp_stack + sizeof(temp_stack);
+ stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
early_gdt_descr.address =
(unsigned long)get_cpu_gdt_table(smp_processor_id());
initial_gs = per_cpu_offset(smp_processor_id());