Re: [PATCH 5/7] ARM: xscale: fix multi-cpu compilation

[Linus Walleij]

On Fri, Aug 9, 2019 at 6:33 PM Arnd Bergmann <arnd@xxxxxxxx> wrote:

> Building a combined ARMv4+XScale kernel produces these
> and other build failures:
>
> /tmp/copypage-xscale-3aa821.s: Assembler messages:
> /tmp/copypage-xscale-3aa821.s:167: Error: selected processor does not support `pld [r7,#0]' in ARM mode
> /tmp/copypage-xscale-3aa821.s:168: Error: selected processor does not support `pld [r7,#32]' in ARM mode
> /tmp/copypage-xscale-3aa821.s:169: Error: selected processor does not support `pld [r1,#0]' in ARM mode
> /tmp/copypage-xscale-3aa821.s:170: Error: selected processor does not support `pld [r1,#32]' in ARM mode
> /tmp/copypage-xscale-3aa821.s:171: Error: selected processor does not support `pld [r7,#64]' in ARM mode
> /tmp/copypage-xscale-3aa821.s:176: Error: selected processor does not support `ldrd r4,r5,[r7],#8' in ARM mode
> /tmp/copypage-xscale-3aa821.s:180: Error: selected processor does not support `strd r4,r5,[r1],#8' in ARM mode

OK we certainly need this.

> Add an explict .arch armv5 in the inline assembly to allow the ARMv5
> specific instructions regardless of the compiler -march= target.

You probably mean...

> +.arch xscale                                   \n\
>         pld     [%0, #0]                        \n\

Explicit .arch xscale rather than .arch armv5.

Yours,
Linus Walleij