On Thu, May 19, 2022 at 10:25 AM Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> wrote:
>
> Add special hook for architecture to verify or setup addr, size
> or prot when ioremap() or iounmap(), which will make the generic
> ioremap more useful.
>
> arch_ioremap() return a pointer,
> - IS_ERR means return an error
> - NULL means continue to remap
> - a non-NULL, non-IS_ERR pointer is directly returned
> arch_iounmap() return a int value,
> - 0 means continue to vunmap
> - error code means skip vunmap and return directly
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
I don't really like interfaces that mix error pointers and NULL pointer
returns.
Would it be possible to have a special error code other than NULL
for the fallback case?
arnd
