sysrq.c:undefined reference to `rcu_sysrq_start'

tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   25153c2ef8124ecd930de79236e7fe25ad2507cb
commit: efc352dc40c65a04c848696805f0300cfb433c36 [254/302] sysrq,rcu: suppress RCU stall warnings while sysrq runs
config: make ARCH=xtensa common_defconfig

All error/warnings:

drivers/built-in.o: In function `fb_register_client':
(.text+0xb3b8): undefined reference to rcu_sysrq_start' drivers/built-in.o: In function fb_register_client':
(.text+0xb3bc): undefined reference to rcu_sysrq_end' drivers/built-in.o: In function sysrq_disconnect':

drivers/built-in.o: In function `sysrq_reinject_alt_sysrq':

net/built-in.o: In function `__netdev_adjacent_dev_remove':
dev.c:(.text+0xe0d9): dangerous relocation: call8: misaligned call target: (.text.unlikely+0x63) net/built-in.o: In function `netdev_rx_csum_fault':
(.text+0xfefc): dangerous relocation: call8: misaligned call target: (.text.unlikely+0x63)

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