From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: Fri, 21 Jun 2024 11:34:47 +0000 (+0200)
Subject: kmsan: disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled
X-Git-Tag: v6.11-rc1~85^2~204
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=854fa98d1dffd65fee741c742b527a7cf8630dd0;p=thirdparty%2Fkernel%2Fstable.git

kmsan: disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled

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.

Link: https://lkml.kernel.org/r/20240621113706.315500-4-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: <kasan-dev@googlegroups.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/Kconfig b/mm/Kconfig
index e15256b6e1355..991fa9cf61373 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -952,6 +952,7 @@ 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