On Sun, 9 Jul 2017, Maciej W. Rozycki wrote:
> Fix a commit 3021773c7c3e ("MIPS: DEC: Avoid la pseudo-instruction in
> delay slots") regression and remove assembly errors:
>
> arch/mips/dec/int-handler.S: Assembler messages:
> arch/mips/dec/int-handler.S:162: Error: Macro used $at after ".set noat"
> arch/mips/dec/int-handler.S:163: Error: Macro used $at after ".set noat"
> arch/mips/dec/int-handler.S:229: Error: Macro used $at after ".set noat"
> arch/mips/dec/int-handler.S:230: Error: Macro used $at after ".set noat"
>
> triggering with with the CPU_DADDI_WORKAROUNDS option set and the DADDIU
> instruction. This is because with that option in place the instruction
> becomes a macro, which expands to an LI/DADDU (or actually ADDIU/DADDU)
> sequence that uses $at as a temporary register. Use ADDIU instead then,
> which is equivalent when used with LUI to compose the intermediate
> 32-bit values.
64-bit DEC configurations unconditionally select CPU_DADDI_WORKAROUNDS,
which in turn requires KBUILD_SYM32 or a build error is triggered in our
top-level arch Makefile. Therefore this issue can be handled better, by
checking for KBUILD_64BIT_SYM32 and then the problematic 64-bit leg of
the #ifdef can be reduced to #error, as not supposed to be ever enabled.
Withdrawing this patch then, I'll send a different one soon.
Maciej