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Commit 88793c03 authored by Liu Xiang's avatar Liu Xiang Committed by Greg Kroah-Hartman
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MIPS: irq: Allocate accurate order pages for irq stack 



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: default avatarLiu Xiang <liu.xiang6@zte.com.cn>
Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Fixes: fe8bd18f ("MIPS: Introduce irq_stack")
Cc: linux-mips@vger.kernel.org
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5691b93f

arch/mips/kernel/irq.c

+2 −2
Original line number Diff line number Diff line
@@ -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,