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powerpc/64: Fix kernel stack 16-byte alignment
Commit4c2de74cc8
("powerpc/64: Interrupts save PPR on stack rather than thread_struct") changed sizeof(struct pt_regs) % 16 from 0 to 8, which causes the interrupt frame allocation on kernel entry to put the kernel stack out of alignment. Quadword (16-byte) alignment for the stack is required by both the 64-bit v1 ABI (v1.9 § 3.2.2) and the 64-bit v2 ABI (v1.1 § 2.2.2.1). Add a pad field to fix alignment, and add a BUILD_BUG_ON to catch this in future. Fixes:4c2de74cc8
("powerpc/64: Interrupts save PPR on stack rather than thread_struct") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -54,6 +54,7 @@ struct pt_regs
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#ifdef CONFIG_PPC64
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unsigned long ppr;
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unsigned long __pad; /* Maintain 16 byte interrupt stack alignment */
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#endif
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};
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#endif
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@ -636,6 +636,8 @@ static void *__init alloc_stack(unsigned long limit, int cpu)
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{
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unsigned long pa;
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BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
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pa = memblock_alloc_base_nid(THREAD_SIZE, THREAD_SIZE, limit,
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early_cpu_to_node(cpu), MEMBLOCK_NONE);
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if (!pa) {
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