The quilt patch titled Subject: kho: warn and exit when unpreserved page wasn't preserved has been removed from the -mm tree. Its filename was kho-warn-and-exit-when-unpreserved-page-wasnt-preserved.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Pratyush Yadav pratyush@kernel.org Subject: kho: warn and exit when unpreserved page wasn't preserved Date: Mon, 3 Nov 2025 19:02:32 +0100
Calling __kho_unpreserve() on a pair of (pfn, end_pfn) that wasn't preserved is a bug. Currently, if that is done, the physxa or bits can be NULL. This results in a soft lockup since a NULL physxa or bits results in redoing the loop without ever making any progress.
Return when physxa or bits are not found, but WARN first to loudly indicate invalid behaviour.
Link: https://lkml.kernel.org/r/20251103180235.71409-3-pratyush@kernel.org Fixes: fc33e4b44b27 ("kexec: enable KHO support for memory preservation") Signed-off-by: Pratyush Yadav pratyush@kernel.org Reviewed-by: Mike Rapoport (Microsoft) rppt@kernel.org Cc: Alexander Graf graf@amazon.com Cc: Baoquan He bhe@redhat.com Cc: Pasha Tatashin pasha.tatashin@soleen.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
kernel/kexec_handover.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/kernel/kexec_handover.c~kho-warn-and-exit-when-unpreserved-page-wasnt-preserved +++ a/kernel/kexec_handover.c @@ -171,12 +171,12 @@ static void __kho_unpreserve(struct kho_ const unsigned long pfn_high = pfn >> order;
physxa = xa_load(&track->orders, order); - if (!physxa) - continue; + if (WARN_ON_ONCE(!physxa)) + return;
bits = xa_load(&physxa->phys_bits, pfn_high / PRESERVE_BITS); - if (!bits) - continue; + if (WARN_ON_ONCE(!bits)) + return;
clear_bit(pfn_high % PRESERVE_BITS, bits->preserve);
_
Patches currently in -mm which might be from pratyush@kernel.org are
maintainers-add-myself-as-a-reviewer-for-kho.patch liveupdate-luo_file-add-private-argument-to-store-runtime-state.patch