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mm/migrate: add folio_movable_ops()

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folio_movable_ops() does the same as page_movable_ops() except uses folios
instead of pages.  This function will help make folio conversions in
migrate.c more readable.

Link: https://lkml.kernel.org/r/20230130214352.40538-3-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vishal Moola (Oracle) 2023-01-30 13:43:50 -08:00 committed by Andrew Morton
parent 3c1ea2c729
commit da707a6d18
2 changed files with 10 additions and 1 deletions
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9
include/linux/migrate.h
View File

@ -122,6 +122,15 @@ static inline bool folio_test_movable(struct folio *folio)
return PageMovable(&folio->page);
}
static inline
const struct movable_operations *folio_movable_ops(struct folio *folio)
{
VM_BUG_ON(!__folio_test_movable(folio));
return (const struct movable_operations *)
((unsigned long)folio->mapping - PAGE_MAPPING_MOVABLE);
}
static inline
const struct movable_operations *page_movable_ops(struct page *page)
{

2
mm/migrate.c
View File

@ -990,7 +990,7 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
goto out;
}
mops = page_movable_ops(&src->page);
mops = folio_movable_ops(src);
rc = mops->migrate_page(&dst->page, &src->page, mode);
WARN_ON_ONCE(rc == MIGRATEPAGE_SUCCESS &&
!folio_test_isolated(src));