mm/gup: Fix some contiguous memmap assumptions

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Several functions in gup.c assume that a compound page has virtually
contiguous page structs.  This isn't true for SPARSEMEM configs unless
SPARSEMEM_VMEMMAP is also set.  Fix them by using nth_page() instead of
plain pointer arithmetic.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>

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Matthew Wilcox (Oracle) 2022-01-07 13:25:55 -05:00

parent 28297dbcad

commit c228afb11a

1 changed files with 7 additions and 7 deletions

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mm/gup.c

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