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From:   Ilya Leoshkevich <iii@linux.ibm.com>
To:     Alexander Gordeev <agordeev@linux.ibm.com>,
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        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
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        Mark Rutland <mark.rutland@arm.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
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        Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH v3 03/34] kmsan: Disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled
Date:   Thu, 14 Dec 2023 00:24:23 +0100
Message-ID: <20231213233605.661251-4-iii@linux.ibm.com>
In-Reply-To: <20231213233605.661251-1-iii@linux.ibm.com>
References: <20231213233605.661251-1-iii@linux.ibm.com>
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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@google.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 mm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/Kconfig b/mm/Kconfig
index 57cd378c73d6..712bcf5f1d20 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -985,6 +985,7 @@ 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
-- 
2.43.0