On Tue, Apr 03, 2018 at 10:24:26AM +0100, Matt Redfearn wrote:
> From: Antony Pavlov <antonynpavlov@gmail.com>
> 
> The commit b35cd9884fa5 ("lib: Add shared copies of some GCC library
> routines") makes it possible to share generic GCC library routines by
> several architectures.
> 
> This commit removes several generic GCC library routines from
> arch/mips/lib/ in favour of similar routines from lib/.
> 
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> [Matt Redfearn] Use GENERIC_LIB_* named Kconfig entries
> Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
> Cc: Palmer Dabbelt <palmer@sifive.com>
> Cc: Matt Redfearn <matt.redfearn@mips.com>
> Cc: James Hogan <jhogan@kernel.org>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: linux-mips@linux-mips.org
> Cc: linux-kernel@vger.kernel.org

ci20_defconfig:
make[1]: *** No rule to make target 'arch/mips/lib/ashldi3.c', needed by 'arch/mips/boot/compressed/ashldi3.c'.  Stop.
make[1]: *** Waiting for unfinished jobs....
make: *** [arch/mips/Makefile +395 : vmlinuz] Error 2

same for db1xxx_defconfig (and possibly others).

Thanks
James