diff mbox series

[03/32] kmsan: Disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled

Message ID 20231115203401.2495875-4-iii@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series kmsan: Enable on s390 | expand

Commit Message

Ilya Leoshkevich Nov. 15, 2023, 8:30 p.m. UTC 
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.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 mm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

Comments

Alexander Potapenko Nov. 16, 2023, 9:41 a.m. UTC | #1 
On Wed, Nov 15, 2023 at 9:34 PM Ilya Leoshkevich <iii@linux.ibm.com> wrote:
>
> 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.

In the future we could probably collect the deferred pages as well,
but it's okay to disable KMSAN for now.

> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
diff mbox series

Patch

diff --git a/mm/Kconfig b/mm/Kconfig
index 89971a894b60..4f2f99339fc7 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