Hi,

kernel test robot <lkp@intel.com> writes:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git testing/next
> head:   3c9722514c3fb74bbe0af87c20bc6b4c47121287
> commit: a0f0bc95705446b8b1476338056bf869271ba36a [32/38] usb: dwc2: override PHY input signals with usb role switch support
> config: arc-randconfig-r016-20200908 (attached as .config)
> compiler: arceb-elf-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout a0f0bc95705446b8b1476338056bf869271ba36a
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
>    arceb-elf-ld: lib/stackdepot.o: in function `filter_irq_stacks':
>    stackdepot.c:(.text+0x5a): undefined reference to `__irqentry_text_start'
>    arceb-elf-ld: stackdepot.c:(.text+0x5a): undefined reference to `__irqentry_text_start'
>    arceb-elf-ld: stackdepot.c:(.text+0x62): undefined reference to `__irqentry_text_end'
>    arceb-elf-ld: stackdepot.c:(.text+0x62): undefined reference to `__irqentry_text_end'
>    arceb-elf-ld: stackdepot.c:(.text+0x6a): undefined reference to `__softirqentry_text_start'
>    arceb-elf-ld: stackdepot.c:(.text+0x6a): undefined reference to `__softirqentry_text_start'
>    arceb-elf-ld: stackdepot.c:(.text+0x72): undefined reference to `__softirqentry_text_end'
>    arceb-elf-ld: stackdepot.c:(.text+0x72): undefined reference to `__softirqentry_text_end'
>    arceb-elf-ld: drivers/usb/dwc2/drd.o: in function `dwc2_drd_role_sw_set':
>>> drd.c:(.text+0x82): undefined reference to `usb_role_switch_get_drvdata'
>>> arceb-elf-ld: drd.c:(.text+0x82): undefined reference to `usb_role_switch_get_drvdata'
>    arceb-elf-ld: drivers/usb/dwc2/drd.o: in function `dwc2_drd_init':
>>> drd.c:(.text+0x1c0): undefined reference to `usb_role_switch_register'
>>> arceb-elf-ld: drd.c:(.text+0x1c0): undefined reference to `usb_role_switch_register'
>    arceb-elf-ld: drivers/usb/dwc2/drd.o: in function `dwc2_drd_exit':
>>> drd.c:(.text+0x2c4): undefined reference to `usb_role_switch_unregister'
>>> arceb-elf-ld: drd.c:(.text+0x2c4): undefined reference to `usb_role_switch_unregister'

Amelie? Have you seen this? Is it ARC-specific?

-- 
balbi