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().


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.
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