Spec: Implement KMP package for OpenSUSE Tumbleweed

At least on OBS, opensuse leap <=16.1 come with linux 6.12,
so no KMP for them...

.github/workflows/obs.yml

@@ -280,6 +280,7 @@ jobs:
           addFilter("dkms-bcachefs.noarch: E: devel-file-in-non-devel-package")
           EOT
           tar -xvf *.tar.xz -C "$OBS_REPO_DIR" --wildcards '*/bcachefs-tools.spec' --strip-components=1
+          tar -xvf *.tar.xz -C "$OBS_REPO_DIR" --wildcards '*/bcachefs-kmp.spec-preambule' --strip-components=1
           tar -xvf *.tar.xz -C "$OBS_REPO_DIR" --wildcards '*/debian/cargo.config' --strip-components=2
           patch "$OBS_REPO_DIR/bcachefs-tools.spec" <<EOF
           --- a/bcachefs-tools.spec

bcachefs-kmp.spec-preambule

@@ -0,0 +1,6 @@
+Requires:	%{name} = %{version}-%{release}
+Requires:	kernel-%1
+Provides:	multiversion(kernel)
+Enhances:	kernel-%1
+Supplements:	(bcachefs-tools and kernel-%1)
+Recommends:	%{name}-ueficert = %{version}

bcachefs-tools.spec

@@ -15,14 +15,24 @@
 
 %global make_opts VERSION="%{version}" BCACHEFS_FUSE=1 BUILD_VERBOSE=1 PREFIX=%{_prefix} ROOT_SBINDIR=%{_sbindir}
 
+%global MSRV 1.77
+%global MINIMAL_KERNEL_VERSION_FOR_TOOLS 6.11.3
+%global MINIMAL_KERNEL_VERSION_FOR_MODULE 6.16
+
+%global _KMP_TMPDIR "%{_tmppath}/%{name}-%{version}-kmp"
+
+%if %{undefined _with_kmp}
+%if 0%{?suse_version} >= 1690
+%global _with_kmp 1
+%endif
+%endif
+
 Name:           bcachefs-tools
 # define with i.e. --define '_version 1.0'
 Version:        0%{?_version}
 Release:        0%{?dist}
 Summary:        Userspace tools for bcachefs
 
-%global MSRV 1.77
-
 # --- rust ---
 # Apache-2.0
 # Apache-2.0 OR MIT
@@ -43,6 +53,7 @@ Source:         bcachefs-tools_%{version}.tar.xz
 Source1:        bcachefs-tools_%{version}.tar.xz.sig
 Source2:        apt.bcachefs.org.keyring
 Source3:        cargo.config
+Source4:        bcachefs-kmp.spec-preambule
 Source99:       %{dkmsname}.rpmlintrc
 %else
 Source:         https://evilpiepirate.org/%{name}/%{name}-vendored-%{version}.tar.zst
@@ -67,7 +78,7 @@ BuildRequires:  rust >= %{MSRV}
 BuildRequires:  rustc >= %{MSRV}
 %endif
 
-BuildRequires:  kernel-headers >= 6.11.3
+BuildRequires:  kernel-headers >= %{MINIMAL_KERNEL_VERSION_FOR_TOOLS}
 BuildRequires:  libaio-devel >= 0.3.111
 BuildRequires:  libattr-devel
 BuildRequires:  pkgconfig(blkid)
@@ -88,6 +99,13 @@ BuildRequires:  pkgconfig
 
 BuildRequires:  systemd-rpm-macros
 
+%if 0%{?_with_kmp} != 0
+BuildRequires:  %kernel_module_package_buildreqs
+BuildRequires:  kernel-devel >= %{MINIMAL_KERNEL_VERSION_FOR_MODULE}
+BuildRequires:  kernel-syms  >= %{MINIMAL_KERNEL_VERSION_FOR_MODULE}
+%kernel_module_package -n %{kmodname} -x xen -p %_sourcedir/bcachefs-kmp.spec-preambule
+%endif
+
 # Rust parts FTBFS on 32-bit arches
 ExcludeArch:    %{ix86} %{arm32}
 
@@ -130,7 +148,7 @@ mount, create, check, modify and correct any inconsistencies in the bcachefs fil
 Summary:        Bcachefs kernel module managed by DKMS
 Requires:       diffutils
 Requires:       dkms >= 3.2.1
-Requires:       kernel-devel >= 6.16
+Requires:       kernel-devel >= %{MINIMAL_KERNEL_VERSION_FOR_MODULE}
 Requires:       gcc
 Requires:       make
 Requires:       perl
@@ -197,6 +215,16 @@ cp %{_sourcedir}/cargo.config $PWD/.cargo/config.toml
 %set_build_flags
 %make_build %{make_opts}
 
+%if 0%{?_with_kmp} != 0
+%make_build install_dkms DKMSDIR="%{_KMP_TMPDIR}/src"
+for kmp_flavor in %{?flavors_to_build}; do
+  rm -Rf "%{_KMP_TMPDIR}/obj-$kmp_flavor"
+  cp -a "%{_KMP_TMPDIR}/src/." "%{_KMP_TMPDIR}/obj-$kmp_flavor"
+  %make_build \
+    -C "%{_KMP_TMPDIR}/obj-$kmp_flavor" \
+    KDIR="/usr/src/linux-obj/%_target_cpu/$kmp_flavor"
+done
+%endif
 
 %install
 %if 0%{?_version} == 0
@@ -212,8 +240,19 @@ cp %{_sourcedir}/cargo.config $PWD/.cargo/config.toml
 # Purge unneeded debian stuff
 rm -rfv %{buildroot}/%{_datadir}/initramfs-tools
 
+%if 0%{?_with_kmp} != 0
+for kmp_flavor in %{?flavors_to_build}; do
+  %make_build \
+    -C "/usr/src/linux-obj/%_target_cpu/$kmp_flavor" \
+    M="%{_KMP_TMPDIR}/obj-$kmp_flavor" \
+    INSTALL_MOD_PATH="%buildroot" \
+    modules_install
+done
+%endif
 
 %changelog
+* Sun Nov 19 2025 Roman Lebedev <lebedev.ri@gmail.com>
+- Implement KMP package for OpenSUSE Tumbleweed
 * Sun Oct 19 2025 Roman Lebedev <lebedev.ri@gmail.com>
 - Fix DKMS support on SUSE
 * Sun Oct 12 2025 Roman Lebedev <lebedev.ri@gmail.com>