[PATCH v4 03/35] kmsan: Disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled

[Ilya Leoshkevich]

KMSAN relies on memblock returning all available pages to it
(see kmsan_memblock_free_pages()). It partitions these pages into 3
categories: pages available to the buddy allocator, shadow pages and
origin pages. This partitioning is static.

If new pages appear after kmsan_init_runtime(), it is considered
an error. DEFERRED_STRUCT_PAGE_INIT causes this, so mark it as
incompatible with KMSAN.

Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
---
 mm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index b4cb45255a54..9791fce5d0a7 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -946,6 +946,7 @@ config DEFERRED_STRUCT_PAGE_INIT
 	depends on SPARSEMEM
 	depends on !NEED_PER_CPU_KM
 	depends on 64BIT
+	depends on !KMSAN
 	select PADATA
 	help
 	  Ordinarily all struct pages are initialised during early boot in a
-- 
2.45.1