Re: [PATCH 2/2] x86/ACPI: Set swiotlb area according to the number of lapic entry in MADT

[Christoph Hellwig]

On Wed, Jul 06, 2022 at 04:57:33PM +0800, Tianyu Lan wrote:
> Swiotlb_init() is called in the mem_init() of different architects and
> memblock free pages are released to the buddy allocator just after
> calling swiotlb_init() via memblock_free_all().

Yes.

> The mem_init() is called before smp_init().

But why would that matter?  cpu_possible_map is set up from
setup_arch(), which is called before that.