Linux 5.11-rc6 compile error

[Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>]

I am seeing the following compile error on Linux 5.11-rc6.
No issues on 5.11.0-rc5 with the same config.

ld: arch/x86/built-in.a: member arch/x86/kernel/pci-swiotlb.o in archive 
is not an object
make: *** [Makefile:1170: vmlinux] Error 1

CONFIG_SWIOTLB_XEN=y
CONFIG_SWIOTLB=y

I can debug further later on today. Checking to see if there are any
known problems.

thanks,
-- Shuah