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

[Tianyu Lan]

On 7/6/2022 5:02 PM, Christoph Hellwig wrote:
> 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.

Sorry. I just still focus online cpu number and the number is got after
smp_init(). Possible cpu number includes some offline cpus. I will have 
a try. Thanks for suggestion.