mm/gup.c: fix comments of __get_user_pages() and get_user_pages_remote()
Fix comments of __get_user_pages() and get_user_pages_remote(), make them more clear. Link: http://lkml.kernel.org/r/1572443533-3118-1-git-send-email-liuxiang_1999@126.com Signed-off-by: Liu Xiang <liuxiang_1999@126.com> Suggested-by: John Hubbard <jhubbard@nvidia.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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mm/gup.c
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mm/gup.c
@ -734,11 +734,17 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
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* Or NULL if the caller does not require them.
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* @nonblocking: whether waiting for disk IO or mmap_sem contention
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*
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* Returns number of pages pinned. This may be fewer than the number
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* requested. If nr_pages is 0 or negative, returns 0. If no pages
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* were pinned, returns -errno. Each page returned must be released
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* with a put_page() call when it is finished with. vmas will only
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* remain valid while mmap_sem is held.
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* Returns either number of pages pinned (which may be less than the
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* number requested), or an error. Details about the return value:
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*
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* -- If nr_pages is 0, returns 0.
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* -- If nr_pages is >0, but no pages were pinned, returns -errno.
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* -- If nr_pages is >0, and some pages were pinned, returns the number of
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* pages pinned. Again, this may be less than nr_pages.
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*
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* The caller is responsible for releasing returned @pages, via put_page().
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*
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* @vmas are valid only as long as mmap_sem is held.
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*
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* Must be called with mmap_sem held. It may be released. See below.
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*
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@ -1107,11 +1113,17 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
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* subsequently whether VM_FAULT_RETRY functionality can be
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* utilised. Lock must initially be held.
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*
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* Returns number of pages pinned. This may be fewer than the number
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* requested. If nr_pages is 0 or negative, returns 0. If no pages
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* were pinned, returns -errno. Each page returned must be released
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* with a put_page() call when it is finished with. vmas will only
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* remain valid while mmap_sem is held.
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* Returns either number of pages pinned (which may be less than the
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* number requested), or an error. Details about the return value:
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*
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* -- If nr_pages is 0, returns 0.
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* -- If nr_pages is >0, but no pages were pinned, returns -errno.
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* -- If nr_pages is >0, and some pages were pinned, returns the number of
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* pages pinned. Again, this may be less than nr_pages.
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*
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* The caller is responsible for releasing returned @pages, via put_page().
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*
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* @vmas are valid only as long as mmap_sem is held.
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*
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* Must be called with mmap_sem held for read or write.
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*
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