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mm/gup: remove no longer used gup_fast_undo_dev_pagemap

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This helper is no longer used after commit fd2825b076 ("mm/gup: remove
pXX_devmap usage from get_user_pages()").

Link: https://lkml.kernel.org/r/20251219-gup-cleanup-v1-1-348a70d9eecb@tencent.com
Signed-off-by: Kairui Song <kasong@tencent.com>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kairui Song 2025-12-19 19:46:00 +08:00 • committed by Andrew Morton
parent 9c9828d3ea
commit 7969f30594
1 changed files with 0 additions and 11 deletions
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11
mm/gup.c
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@ -2806,17 +2806,6 @@ static bool gup_fast_folio_allowed(struct folio *folio, unsigned int flags)
return !reject_file_backed || shmem_mapping(mapping);
}
static void __maybe_unused gup_fast_undo_dev_pagemap(int *nr, int nr_start,
unsigned int flags, struct page **pages)
{
while ((*nr) - nr_start) {
struct folio *folio = page_folio(pages[--(*nr)]);
folio_clear_referenced(folio);
gup_put_folio(folio, 1, flags);
}
}
#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
/*
* GUP-fast relies on pte change detection to avoid concurrent pgtable