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mm: gup: remove FOLL_SPLIT

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Since commit 5a52c9df62 ("uprobe: use FOLL_SPLIT_PMD instead of
FOLL_SPLIT") and commit ba925fa350 ("s390/gmap: improve THP splitting")
FOLL_SPLIT has not been used anymore.  Remove the dead code.

Link: https://lkml.kernel.org/r/20210330203900.9222-1-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yang Shi
2021-04-29 22:55:56 -07:00
committed by Linus Torvalds
parent 1d4b0166e3
commit 4066c11948
3 changed files with 2 additions and 32 deletions
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5
Documentation/vm/transhuge.rst
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@@ -53,11 +53,6 @@ prevent the page from being split by anyone.
of handling GUP on hugetlbfs will also work fine on transparent
hugepage backed mappings.
In case you can't handle compound pages if they're returned by
follow_page, the FOLL_SPLIT bit can be specified as a parameter to
follow_page, so that it will split the hugepages before returning
them.
Graceful fallback
=================