merge upstream

Reviewed-on: ExpanMesha/kernel-source#1

config.sh

@@ -4,7 +4,7 @@ SRCVERSION=6.19
 VARIANT=
 # enable kernel module compression
 COMPRESS_MODULES="zstd"
-COMPRESS_VMLINUX="xz"
+COMPRESS_VMLINUX="zstd"
 # Compile binary devicetrees on master and stable branches.
 BUILD_DTBS="Yes"
 # Generate a _multibuild file

kernel-default.spec

@@ -22,12 +22,12 @@
 %define git_commit 446493f9fc3dbefd47467f2eb1f8b5ce43f14cdf
 %define variant %{nil}
 %define compress_modules zstd
-%define compress_vmlinux xz
+%define compress_vmlinux zstd
 %define livepatch livepatch%{nil}
 %define livepatch_rt %{nil}
 %define sb_efi_only 0
 %define split_base 0
-%define split_optional 0
+%define split_optional 1
 %define supported_modules_check 0
 %define build_flavor default
 %define generate_compile_commands 1