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mm: Add flush_dcache_folio()

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This is a default implementation which calls flush_dcache_page() on
each page in the folio.  If architectures can do better, they should
implement their own version of it.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle)
2020-12-16 11:06:33 -05:00
parent 646010009d
commit 08b0b0059b
12 changed files with 39 additions and 4 deletions
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6
Documentation/core-api/cachetlb.rst
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@@ -326,6 +326,12 @@ maps this page at its virtual address.
dirty. Again, see sparc64 for examples of how
to deal with this.
``void flush_dcache_folio(struct folio *folio)``
This function is called under the same circumstances as
flush_dcache_page(). It allows the architecture to
optimise for flushing the entire folio of pages instead
of flushing one page at a time.
``void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long user_vaddr, void *dst, void *src, int len)``
``void copy_from_user_page(struct vm_area_struct *vma, struct page *page,