mm/zsmalloc: use a proper page type

Let's clean it up: use a proper page type and store our data (offset into
a page) in the lower 16 bit as documented.

We won't be able to support 256 KiB base pages, which is acceptable. 
Teach Kconfig to handle that cleanly using a new CONFIG_HAVE_ZSMALLOC.

Based on this, we should do a proper "struct zsdesc" conversion, as
proposed in [1].

This removes the last _mapcount/page_type offender.

[1] https://lore.kernel.org/all/[email protected]/

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Tested-by: Sergey Senozhatsky <[email protected]>	[zram/zsmalloc workloads]
Reviewed-by: Sergey Senozhatsky <[email protected]>
Cc: Hyeonggon Yoo <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Mike Rapoport (IBM) <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions