On Fri, Aug 8, 2025 at 11:47 AM Pratyush Yadav [off-list ref] wrote:

On Thu, Aug 07 2025, Pasha Tatashin wrote:

quoted

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@soleen.com>

Nit: Drop the blank line before fixes. git interpret-trailers doesn't

Makes sense.

seem to recognize the fixes otherwise, so this may break some tooling.
Try it yourself:

    $ git interpret-trailers --parse commit_message.txt

Other than this,

Acked-by: Pratyush Yadav <pratyush@kernel.org>

Thank you for the review.

Pasha

quoted

Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
 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

--
Regards,
Pratyush Yadav