Re: [PATCH v2 1/1] s390/kexec: Make KEXEC_SIG available when CONFIG_MODULES=n

[Heiko Carstens <hca@linux.ibm.com>]

On Mon, Feb 16, 2026 at 07:29:16AM +0100, Alexander Egorenkov wrote:
> The commit c8424e776b09 ("MODSIGN: Export module signature definitions")
> replaced the dependency of KEXEC_SIG on SYSTEM_DATA_VERIFICATION with
> the dependency on MODULE_SIG_FORMAT. This change disables KEXEC_SIG
> in s390 kernels built with MODULES=n if nothing else selects
> MODULE_SIG_FORMAT.
> 
> Furthermore, the signature verification in s390 kexec does not require
> MODULE_SIG_FORMAT because it requires only the struct module_signature and,
> therefore, does not depend on code in kernel/module_signature.c.
> 
> But making ARCH_SUPPORTS_KEXEC_SIG depend on SYSTEM_DATA_VERIFICATION
> is also incorrect because it makes KEXEC_SIG available on s390 only
> if some other arbitrary option (for instance a file system or device driver)
> selects it directly or indirectly.
> 
> To properly make KEXEC_SIG available for s390 kernels built with MODULES=y
> as well as MODULES=n _and_ also not depend on arbitrary options selecting
> SYSTEM_DATA_VERIFICATION, we set ARCH_SUPPORTS_KEXEC_SIG=y for s390 and
> select SYSTEM_DATA_VERIFICATION when KEXEC_SIG=y.
> 
> Fixes: c8424e776b09 ("MODSIGN: Export module signature definitions")
> Suggested-by: Heiko Carstens <hca@linux.ibm.com>
> Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
> ---
> 
> Changes v1 -> v2:
> - Let S390 config option select SYSTEM_DATA_VERIFICATION if KEXEC_SIG is selected
> 
>  arch/s390/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied, thanks!