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Subject[RFC 15/17] x86/boot/32: Fix cpu_current_top_of_stack initialization at boot
Date
cpu_current_top_of_stack's initialization forgot about
TOP_OF_KERNEL_STACK_PADDING. This bug didn't matter because the
idle threads never enter user mode.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
arch/x86/kernel/smpboot.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index b474c8de7fba..e6544bac7c51 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -958,8 +958,7 @@ void common_cpu_up(unsigned int cpu, struct task_struct *idle)
#ifdef CONFIG_X86_32
/* Stack for startup_32 can be just as for start_secondary onwards */
irq_ctx_init(cpu);
- per_cpu(cpu_current_top_of_stack, cpu) =
- (unsigned long)task_stack_page(idle) + THREAD_SIZE;
+ per_cpu(cpu_current_top_of_stack, cpu) = task_top_of_stack(idle);
#else
initial_gs = per_cpu_offset(cpu);
#endif
--
2.13.5
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