On 2022/5/24 20:37, Arnd Bergmann wrote:
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?
I don't find a good error code, maybe ENOTSUPP, any better suggestion?
arnd
.
