linux-kernel - [PATCH v2 02/32] kho: mm: Don't allow deferred struct page with KHO

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Message-ID: <20250723144649.1696299-3-pasha.tatashin@soleen.com>
Date: Wed, 23 Jul 2025 14:46:15 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: [PATCH v2 02/32] kho: mm: Don't allow deferred struct page with KHO

KHO uses struct pages for the preserved memory early in boot, however,
with deferred struct page initialization, only a small portion of
memory has properly initialized struct pages.

This problem was detected where vmemmap is poisoned, and illegal flag
combinations are detected.

Don't allow them to be enabled together, and later we will have to
teach KHO to work properly with deferred struct page init kernel
feature.

Fixes: 990a950fe8fd ("kexec: add config option for KHO")

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 kernel/Kconfig.kexec | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 2ee603a98813..1224dd937df0 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -97,6 +97,7 @@ config KEXEC_JUMP
 config KEXEC_HANDOVER
 	bool "kexec handover"
 	depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
+	depends on !DEFERRED_STRUCT_PAGE_INIT
 	select MEMBLOCK_KHO_SCRATCH
 	select KEXEC_FILE
 	select DEBUG_FS
-- 
2.50.0.727.gbf7dc18ff4-goog