Add support for building ipaclones

While Fedora doesn't officially support kpatch, there's work
being done to enable kpatch elsewhere. Add the packaging work
but don't actually build anything.

kernel.spec

@@ -133,6 +133,11 @@ Summary: The Linux kernel
 # gcov support
 %define with_gcov %{?_with_gcov: 1} %{?!_with_gcov: 0}
 
+#
+# ipa_clone support
+%define with_ipaclones %{?_without_ipaclones: 0} %{?!_without_ipaclones: 1}
+
+
 # Set debugbuildsenabled to 1 for production (build separate debug kernels)
 #  and 0 for rawhide (all kernels are debug kernels).
 # See also 'make debug' and 'make release'.
@@ -144,6 +149,8 @@ Summary: The Linux kernel
 %define with_cross_headers 0
 # no selftests for now
 %define with_selftests 0
+# no ipa_clone for now
+%define with_ipaclones 0
 %endif
 
 %if %{with_verbose}
@@ -189,6 +196,16 @@ Summary: The Linux kernel
 %define with_kabidwchk 0
 %endif
 
+# kpatch_kcflags are extra compiler flags applied to base kernel
+# -fdump-ipa-clones is enabled only for base kernels on selected arches
+%if %{with_ipaclones}
+%ifarch x86_64 ppc64le
+%define kpatch_kcflags -fdump-ipa-clones
+%else
+%define with_ipaclones 0
+%endif
+%endif
+
 %define make_target bzImage
 %define image_install_path boot
 
@@ -750,6 +767,18 @@ This package provides kernel headers and makefiles sufficient to build modules\
 against the %{?2:%{2} }kernel package.\
 %{nil}
 
+#
+# kernel-<variant>-ipaclones-internal package
+#
+%define kernel_ipaclones_package() \
+%package %{?1:%{1}-}ipaclones-internal\
+Summary: *.ipa-clones files generated by -fdump-ipa-clones for kernel%{?1:-%{1}}\
+Group: System Environment/Kernel\
+AutoReqProv: no\
+%description %{?1:%{1}-}ipaclones-internal\
+This package provides *.ipa-clones files.\
+%{nil}
+
 #
 # This macro creates a kernel-<subpackage>-modules-extra package.
 #	%%kernel_modules_extra_package <subpackage> <pretty-name>
@@ -858,6 +887,10 @@ Linux operating system.  The kernel handles the basic functions
 of the operating system: memory allocation, process allocation, device
 input and output, etc.
 
+%if %{with_ipaclones}
+%kernel_ipaclones_package
+%endif
+
 %prep
 # do a few sanity-checks for --with *only builds
 %if %{with_baseonly}
@@ -1574,6 +1607,18 @@ BuildKernel() {
 
     # build a BLS config for this kernel
     %{SOURCE43} "$KernelVer" "$RPM_BUILD_ROOT" "%{?variant}"
+
+%if %{with_ipaclones}
+    MAXPROCS=$(echo %{?_smp_mflags} | sed -n 's/-j\s*\([0-9]\+\)/\1/p')
+    if [ -z "$MAXPROCS" ]; then
+        MAXPROCS=1
+    fi
+    if [ "$Flavour" == "" ]; then
+        mkdir -p $RPM_BUILD_ROOT/$DevelDir-ipaclones
+        find . -name '*.ipa-clones' | xargs -i{} -r -n 1 -P $MAXPROCS install -m 644 -D "{}" "$RPM_BUILD_ROOT/$DevelDir-ipaclones/{}"
+    fi
+%endif
+
 }
 
 ###
@@ -1985,6 +2030,19 @@ fi
 %kernel_variant_files %{_use_vdso} %{with_debug} debug
 %kernel_variant_files %{use_vdso} %{with_pae} lpae
 
+%define kernel_variant_ipaclones(k:) \
+%if %{1}\
+%if %{with_ipaclones}\
+%{expand:%%files %{?2:%{2}-}ipaclones-internal}\
+%defattr(-,root,root)\
+%defverify(not mtime)\
+/usr/src/kernels/%{KVERREL}%{?2:+%{2}}-ipaclones\
+%endif\
+%endif\
+%{nil}
+
+%kernel_variant_ipaclones %{with_up}
+
 # plz don't put in a version string unless you're going to tag
 # and build.
 #