On 2024/2/2 3:27, Matthew Wilcox wrote:
On Mon, Jan 29, 2024 at 03:09:27PM +0800, Kefeng Wang wrote:
Use newfolio/folio for migrate_folio_extra()/migrate_folio() to
save three compound_head() calls.
I've looked at this function before and I get stuck on the question of
whether a device page truly is a folio or not. I think for the moment,
we've decided that it is, so ..
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Although ...
@@ -729,13 +730,12 @@ static void __migrate_device_pages(unsigned long *src_pfns,
}
mapping = page_mapping(page);
+ folio = page_folio(page);
+ newfolio = page_folio(newpage);
you should save one more call to compound_head() by changing the
page_mapping() to folio_mapping().
Missing this one, will update, thanks.
