Merge patch series "kexec: fix probe error codes and error propagation"

Mukesh Pilaniya <mpilaniy@redhat.com> says:

kexec: fix probe error codes and error propagation

While debugging a misleading error on s390x where kexec -s reported
"syscall kexec_file_load not available" instead of the actual EINVAL
from a kernel command line that exceeded the architecture limit, it was
found that some kexec image probe functions return -EINVAL instead of
-ENOEXEC for format mismatches, and kexec_image_probe_default() has a
bug where it returns whatever the last loader returned rather than
always returning -ENOEXEC when no loader matches.

* Fix all probe functions to return -ENOEXEC when they do not recognize
  the image format.
* Fix kexec_image_probe_default() to distinguish format mismatches
  (-ENOEXEC) from real errors (e.g. -ENOMEM), propagating real errors
  immediately and only continuing to the next loader on -ENOEXEC.

kexec-tools patch:
https://lore.kernel.org/all/20260814075329.30203-1-mpilaniy@redhat.com/

Link: https://patch.msgid.link/20260821-mpilaniy-v3-0-76b355399d2e@redhat.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

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