[PATCH v2 01/11] mm/ioremap: change the return value of io[re|un]map_allowed and rename

[Christoph Hellwig]

On Sat, Aug 20, 2022 at 08:31:15AM +0800, Baoquan He wrote:
> +void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot);

Please avoid the overly long lines.

I also wonder if we just want a common definition with a __weak default
instead of duplicating it in many arch headers.

> +	ioaddr = arch_ioremap(phys_addr, size, prot);
> +	if (IS_ERR(ioaddr))
> +		return NULL;
> +	else if (ioaddr)
> +		return ioaddr;

No need for the else here.