From 43d746dc49bb4c82034fce01a92fe67344d664cf Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Wed, 29 May 2024 13:19:01 +0200 Subject: 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/20231130101242.2590384-1-42.hyeyoo@gmail.com/ Link: https://lkml.kernel.org/r/20240529111904.2069608-4-david@redhat.com Signed-off-by: David Hildenbrand Tested-by: Sergey Senozhatsky [zram/zsmalloc workloads] Reviewed-by: Sergey Senozhatsky Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Matthew Wilcox (Oracle) Cc: Mike Rapoport (IBM) Cc: Minchan Kim Signed-off-by: Andrew Morton --- include/linux/page-flags.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index d221a6a14764..0f7c7320391e 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -947,6 +947,7 @@ enum pagetype { PG_guard = 0x08000000, PG_hugetlb = 0x04000000, PG_slab = 0x02000000, + PG_zsmalloc = 0x01000000, PAGE_TYPE_BASE = 0x80000000, @@ -1071,6 +1072,8 @@ FOLIO_TYPE_OPS(hugetlb, hugetlb) FOLIO_TEST_FLAG_FALSE(hugetlb) #endif +PAGE_TYPE_OPS(Zsmalloc, zsmalloc, zsmalloc) + /** * PageHuge - Determine if the page belongs to hugetlbfs * @page: The page to test. -- cgit v1.2.3