[PATCH 20/20] ARC: pt_regs: create seperate type for ecr

[Pavel.Kozlov at synopsys.com]

Hi Vineet,

I'm testing your updates and ran into the same build issue reported by the build 
robot.
http://lists.infradead.org/pipermail/linux-snps-arc/2023-August/007522.html

> #ifdef CONFIG_ISA_ARCOMPACT
> @@ -40,18 +51,7 @@ struct pt_regs {
>           *        Last word used by Linux for extra state mgmt (syscall-restart)
>           * For interrupts, use artificial ECR values to note current prio-level
>           */
> -       union {
> -               struct {
> -#ifdef CONFIG_CPU_BIG_ENDIAN
> -                       unsigned long state:8, ecr_vec:8,
> -                                     ecr_cause:8, ecr_param:8;
> -#else
> -                       unsigned long ecr_param:8, ecr_cause:8,
> -                                     ecr_vec:8, state:8;
> -#endif
> -               };
> -               unsigned long event;
> -       };
> +       ecr_reg ecr;
> }
>
> #define MAX_REG_OFFSET offsetof(struct pt_regs, event)

This change causes a build issue for ARC700, as the event field has been
removed and the MAX_REG_OFFSET macro hasn't been updated.

Regards,
Pavel