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SubjectRe: [PATCH v8 13/25] m68k: Dispatch nvram_ops calls to Atari or Mac functions
On Wed, Dec 26, 2018 at 1:43 AM Finn Thain <fthain@telegraphics.com.au> wrote:

> +
> +static ssize_t m68k_nvram_get_size(void)
> +{
> + if (MACH_IS_ATARI)
> + return atari_nvram_get_size();
> + else if (MACH_IS_MAC)
> + return mac_pram_get_size();
> + return -ENODEV;
> +}
> +
> +/* Atari device drivers call .read (to get checksum validation) whereas
> + * Mac and PowerMac device drivers just use .read_byte.
> + */
> +const struct nvram_ops arch_nvram_ops = {
> +#ifdef CONFIG_MAC
> + .read_byte = m68k_nvram_read_byte,
> + .write_byte = m68k_nvram_write_byte,
> +#endif
> +#ifdef CONFIG_ATARI
> + .read = m68k_nvram_read,
> + .write = m68k_nvram_write,
> + .set_checksum = m68k_nvram_set_checksum,
> + .initialize = m68k_nvram_initialize,
> +#endif
> + .get_size = m68k_nvram_get_size,
> +};
> +EXPORT_SYMBOL(arch_nvram_ops);

Since the operations are almost entirely distinct, why not have two
separate 'nvram_ops' instances here that each refer to just
the set they actually need?

I was actually expecting one more patch here that would make the
arch_nvram_ops a pointer to one of multiple structures, which would
be easier to do with multiple copies, but I suppose there is no need
for that here (there might be on ppc, I have to look again).

Arnd

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