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    Subject[PATCH v3 17/51] x86/smp: fix initial idle stack location on 32-bit
    Date
    On 32-bit, the initial idle stack calculation doesn't take into account
    the TOP_OF_KERNEL_STACK_PADDING, making the stack end address
    inconsistent with other tasks on 32-bit.

    Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
    ---
    arch/x86/kernel/smpboot.c | 4 +---
    1 file changed, 1 insertion(+), 3 deletions(-)

    diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
    index d9d3d67..1158a72 100644
    --- a/arch/x86/kernel/smpboot.c
    +++ b/arch/x86/kernel/smpboot.c
    @@ -957,9 +957,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
    int cpu0_nmi_registered = 0;
    unsigned long timeout;

    - idle->thread.sp = (unsigned long) (((struct pt_regs *)
    - (THREAD_SIZE + task_stack_page(idle))) - 1);
    -
    + idle->thread.sp = (unsigned long)task_pt_regs(idle);
    early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
    initial_code = (unsigned long)start_secondary;
    initial_stack = idle->thread.sp;
    --
    2.7.4
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