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| author | Mike Kravetz | 2017-02-23 00:42:49 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2017-02-23 01:41:28 +0100 |
| commit | fa4d75c1de13299c61b5e18a1ae46bc00888b599 (patch) | |
| tree | 73ca3cf8aac2fa991fc7310658145d49772f0b49 /include/linux/mm.h | |
| parent | userfaultfd: non-cooperative: wake userfaults after UFFDIO_UNREGISTER (diff) | |
| download | kernel-qcow2-linux-fa4d75c1de13299c61b5e18a1ae46bc00888b599.tar.gz kernel-qcow2-linux-fa4d75c1de13299c61b5e18a1ae46bc00888b599.tar.xz kernel-qcow2-linux-fa4d75c1de13299c61b5e18a1ae46bc00888b599.zip | |
userfaultfd: hugetlbfs: add copy_huge_page_from_user for hugetlb userfaultfd support
userfaultfd UFFDIO_COPY allows user level code to copy data to a page at
fault time. The data is copied from user space to a newly allocated
huge page. The new routine copy_huge_page_from_user performs this copy.
Link: http://lkml.kernel.org/r/20161216144821.5183-17-aarcange@redhat.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Michael Rapoport <RAPOPORT@il.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 3787f047a098..6bc7f2c1a6d1 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2424,6 +2424,9 @@ extern void clear_huge_page(struct page *page, extern void copy_user_huge_page(struct page *dst, struct page *src, unsigned long addr, struct vm_area_struct *vma, unsigned int pages_per_huge_page); +extern long copy_huge_page_from_user(struct page *dst_page, + const void __user *usr_src, + unsigned int pages_per_huge_page); #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ extern struct page_ext_operations debug_guardpage_ops; |