sha256 functions prevents kernel compile

[rstanislav]

Hello! I'm trying to cross compile RPi4 kernel (5.4.y.) with mptcp trunk patch, after few recent updates its broken now:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs

LD .tmp_vmlinux.kallsyms1 net/mptcp/mptcp_ctrl.o: In function mptcp_key_sha256': mptcp_ctrl.c:(.text+0x794): undefined reference tosha256_update' mptcp_ctrl.c:(.text+0x7a0): undefined reference to sha256_final' net/mptcp/mptcp_ctrl.o: In functionmptcp_hmac_sha256': mptcp_ctrl.c:(.text+0xe48): undefined reference to sha256_update' mptcp_ctrl.c:(.text+0xe54): undefined reference tosha256_final' mptcp_ctrl.c:(.text+0xf1c): undefined reference to sha256_update' mptcp_ctrl.c:(.text+0xf28): undefined reference tosha256_final' Makefile:1080: recipe for target 'vmlinux' failed make: *** [vmlinux] Error 1

Host is ubuntu 18.04 x64, libssl-dev is installed, version 1.1.1

Can someone help me please ?

[matttbe]

Hello

Can you check if CONFIG_CRYPTO_SHA256 kernel config is enabled please?

[rstanislav]

It was checked as loadable module (m) - changed to builtin, compiled without problems! Spend almost a day to find a solution. Thanks alot for help!