On Thu 21-09-23 21:07:38, Matthew Wilcox (Oracle) wrote:
> This is the folio equivalent of unmap_and_put_page(), which remains as
> a wrapper for it.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
I'm missing a patch 10/10 in this series (and a coverletter would be nice
as well)... What's there ;)?
Honza
> ---
> include/linux/highmem.h | 18 ++++++++++++++++--
> 1 file changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/highmem.h b/include/linux/highmem.h
> index 99c474de800d..4cacc0e43b51 100644
> --- a/include/linux/highmem.h
> +++ b/include/linux/highmem.h
> @@ -551,10 +551,24 @@ static inline void folio_zero_range(struct folio *folio,
> zero_user_segments(&folio->page, start, start + length, 0, 0);
> }
>
> -static inline void unmap_and_put_page(struct page *page, void *addr)
> +/**
> + * folio_release_kmap - Unmap a folio and drop a refcount.
> + * @folio: The folio to release.
> + * @addr: The address previously returned by a call to kmap_local_folio().
> + *
> + * It is common, eg in directory handling to kmap a folio. This function
> + * unmaps the folio and drops the refcount that was being held to keep the
> + * folio alive while we accessed it.
> + */
> +static inline void folio_release_kmap(struct folio *folio, void *addr)
> {
> kunmap_local(addr);
> - put_page(page);
> + folio_put(folio);
> +}
> +
> +static inline void unmap_and_put_page(struct page *page, void *addr)
> +{
> + folio_release_kmap(page_folio(page), addr);
> }
>
> #endif /* _LINUX_HIGHMEM_H */
> --
> 2.40.1
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
