Решил я тут собрать для RPi 4 ядро с поддержкой mptcp.
Делал по разным мануалам. Но всё про старое.
По новому ядру и mptcp 0.95 ничего нет, ну и фик сним.
В общем всё более менее фиксилось.
Но застопорилось тут:
OBJCOPY arch/arm/boot/Image
Building modules, stage 2.
Kernel: arch/arm/boot/Image is ready
MODPOST 2924 modules
SHIPPED arch/arm/boot/compressed/hyp-stub.S
SHIPPED arch/arm/boot/compressed/lib1funcs.S
SHIPPED arch/arm/boot/compressed/ashldi3.S
SHIPPED arch/arm/boot/compressed/bswapsdi2.S
LDS arch/arm/boot/compressed/
vmlinux.lds AS arch/arm/boot/compressed/head.o
XZKERN arch/arm/boot/compressed/piggy_data
CC arch/arm/boot/compressed/misc.o
CC arch/arm/boot/compressed/decompress.o
CC arch/arm/boot/compressed/string.o
AS arch/arm/boot/compressed/hyp-stub.o
AS arch/arm/boot/compressed/lib1funcs.o
AS arch/arm/boot/compressed/ashldi3.o
AS arch/arm/boot/compressed/bswapsdi2.o
ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined!
scripts/Makefile.modpost:92: recipe for target '__modpost' failed
make[1]: *** [__modpost] Error 1
Makefile:1235: recipe for target 'modules' failed
make: *** [modules] Error 2
make: *** Waiting for unfinished jobs....
Вот по этому __sync_icache нагуглилось следущее
https://github.com/dbaluta/linux/commit/a78d14a31666c636a9e00a589032119fb59e3b94или просто xen в конфиге вырубить?