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SubjectRe: [PATCH 1/9] mm: turn migrate_vma upside down
On Tue, Jul 30, 2019 at 06:46:25PM -0700, Ralph Campbell wrote:
>> for (i = 0; i < npages; i += c) {
>> - unsigned long next;
>> -
>> c = min(SG_MAX_SINGLE_ALLOC, npages);
>> - next = start + (c << PAGE_SHIFT);
>> - ret = migrate_vma(&nouveau_dmem_migrate_ops, vma, start,
>> - next, src_pfns, dst_pfns, &migrate);
>> + args.end = start + (c << PAGE_SHIFT);
>
> Since migrate_vma_setup() is called in a loop, either args.cpages and
> args.npages need to be cleared here or cleared in migrate_vma_setup().

I think clearing everything that is not used for argument passing in
migrate_vma_setup is a good idea. I'll do that.

Btw, it seems like this was a fullquote just for the little comment
as far as I could tell from wading through it. It would be very
appreciated to properly quote the replies.

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