Commit a930c210 authored May 19, 2022 by Miaohe Lin Committed by Andrew Morton May 19, 2022

mm/swap: fix the obsolete comment for SWP_TYPE_SHIFT

Since commit 3159f943 ("xarray: Replace exceptional entries"), there
is only one bit of 'type' can be shifted up.  Update the corresponding
comment.

Link: https://lkml.kernel.org/r/20220509131416.17553-13-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent 4b9ae842

include/linux/swapops.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -13,10 +13,10 @@
		* get good packing density in that tree, so the index should be dense in
		* the low-order bits.
		*
		* We arrange the `type' and `offset' fields so that `type' is at the seven
		* We arrange the `type' and `offset' fields so that `type' is at the six
		* high-order bits of the swp_entry_t and `offset' is right-aligned in the
		* remaining bits. Although `type' itself needs only five bits, we allow for
		* shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry().
		* shmem/tmpfs to shift it all up a further one bit: see swp_to_radix_entry().
		*
		* swp_entry_t's are never stored anywhere in their arch-dependent format.
		*/