+ kho-warn-if-kho-is-disabled-due-to-an-error.patch added to mm-hotfixes-unstable branch

+ kho-warn-if-kho-is-disabled-due-to-an-error.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: kho: warn if KHO is disabled due to an error
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     kho-warn-if-kho-is-disabled-due-to-an-error.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kho-warn-if-kho-is-disabled-due-to-an-error.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Pasha Tatashin <pasha.tatashin@soleen.com>
Subject: kho: warn if KHO is disabled due to an error
Date: Fri, 8 Aug 2025 20:18:04 +0000

During boot scratch area is allocated based on command line parameters or
auto calculated.  However, scratch area may fail to allocate, and in that
case KHO is disabled.  Currently, no warning is printed that KHO is
disabled, which makes it confusing for the end user to figure out why KHO
is not available.  Add the missing warning message.

Link: https://lkml.kernel.org/r/20250808201804.772010-4-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Baoquan He <bhe@redhat.com>
Cc: Changyuan Lyu <changyuanl@google.com>
Cc: Coiby Xu <coxu@redhat.com>
Cc: Dave Vasilevsky <dave@vasilevsky.ca>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Kees Cook <kees@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/kexec_handover.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/kexec_handover.c~kho-warn-if-kho-is-disabled-due-to-an-error
+++ a/kernel/kexec_handover.c
@@ -564,6 +564,7 @@ err_free_scratch_areas:
 err_free_scratch_desc:
 	memblock_free(kho_scratch, kho_scratch_cnt * sizeof(*kho_scratch));
 err_disable_kho:
+	pr_warn("Failed to reserve scratch area, disabling kexec handover\n");
 	kho_enable = false;
 }
 
_

Patches currently in -mm which might be from pasha.tatashin@soleen.com are

kho-init-new_physxa-phys_bits-to-fix-lockdep.patch
kho-mm-dont-allow-deferred-struct-page-with-kho.patch
kho-warn-if-kho-is-disabled-due-to-an-error.patch