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...

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

Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days

------------------------------------------------------ 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