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    Subject[PATCH 4.20 66/76] MIPS: irq: Allocate accurate order pages for irq stack
    Date
    4.20-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Liu Xiang <liu.xiang6@zte.com.cn>

    commit 72faa7a773ca59336f3c889e878de81445c5a85c upstream.

    The irq_pages is the number of pages for irq stack, but not the
    order which is needed by __get_free_pages().
    We can use get_order() to calculate the accurate order.

    Signed-off-by: Liu Xiang <liu.xiang6@zte.com.cn>
    Signed-off-by: Paul Burton <paul.burton@mips.com>
    Fixes: fe8bd18ffea5 ("MIPS: Introduce irq_stack")
    Cc: linux-mips@vger.kernel.org
    Cc: stable@vger.kernel.org # v4.11+
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/mips/kernel/irq.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/arch/mips/kernel/irq.c
    +++ b/arch/mips/kernel/irq.c
    @@ -52,6 +52,7 @@ asmlinkage void spurious_interrupt(void)
    void __init init_IRQ(void)
    {
    int i;
    + unsigned int order = get_order(IRQ_STACK_SIZE);

    for (i = 0; i < NR_IRQS; i++)
    irq_set_noprobe(i);
    @@ -62,8 +63,7 @@ void __init init_IRQ(void)
    arch_init_irq();

    for_each_possible_cpu(i) {
    - int irq_pages = IRQ_STACK_SIZE / PAGE_SIZE;
    - void *s = (void *)__get_free_pages(GFP_KERNEL, irq_pages);
    + void *s = (void *)__get_free_pages(GFP_KERNEL, order);

    irq_stack[i] = s;
    pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,

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