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mm: use "GUP-fast" instead "fast GUP" in remaining comments

Let's fixup the remaining comments to consistently call that thing
"GUP-fast". With this change, we consistently call it "GUP-fast".

Link: https://lkml.kernel.org/r/20240402125516.223131-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

David Hildenbrand and committed by
Andrew Morton 0ae0b2b3 25176ad0

+2 -2
+1 -1
mm/filemap.c
··· 1810 1810 * C. Return the page to the page allocator 1811 1811 * 1812 1812 * This means that any page may have its reference count temporarily 1813 - * increased by a speculative page cache (or fast GUP) lookup as it can 1813 + * increased by a speculative page cache (or GUP-fast) lookup as it can 1814 1814 * be allocated by another user before the RCU grace period expires. 1815 1815 * Because the refcount temporarily acquired here may end up being the 1816 1816 * last refcount on the page, any page allocation must be freeable by
+1 -1
mm/khugepaged.c
··· 1153 1153 * huge and small TLB entries for the same virtual address to 1154 1154 * avoid the risk of CPU bugs in that area. 1155 1155 * 1156 - * Parallel fast GUP is fine since fast GUP will back off when 1156 + * Parallel GUP-fast is fine since GUP-fast will back off when 1157 1157 * it detects PMD is changed. 1158 1158 */ 1159 1159 _pmd = pmdp_collapse_flush(vma, address, pmd);