kho-warn-and-exit-when-unpreserved-page-wasnt-preserved.patch removed from -mm tree

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 <[email protected]>
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.

---

 kernel/kexec_handover.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -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 [email protected] are

maintainers-add-myself-as-a-reviewer-for-kho.patch liveupdate-luo_file-add-private-argument-to-store-runtime-state.patch