these marcos are used to get the value or address of a member of a `__iomem`
structure.
GET_FIELDADDR is like &iomem_obj->field, and
GET_FIELD32 is iomem_obj->u32val, GET_FIELD64 is iomem_obj->u64val.
If patch the .c file directly, the source gets into a mess.
On 09/16/2016 03:52 PM, Greg KH wrote:
> On Tue, Sep 13, 2016 at 07:59:50PM -0700, Peng Sun wrote:
>> Signed-off-by: Peng Sun <sironhide0n...@gmail.com>
>> ---
>> drivers/staging/slicoss/slic.h | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/staging/slicoss/slic.h b/drivers/staging/slicoss/slic.h
>> index fe1d2ce..7c23190 100644
>> --- a/drivers/staging/slicoss/slic.h
>> +++ b/drivers/staging/slicoss/slic.h
>> @@ -539,6 +539,13 @@ static inline void slic_flush_write(struct adapter
>> *adapter)
>> ioread32(adapter->regs + SLIC_REG_HOSTID);
>> }
>>
>> +#define IOMEM_GET_FIELDADDR(base, member) \
>> +({ \
>> + char __iomem *_base = (char __iomem *)base; \
>> + _base += offsetof(typeof(*base), member); \
>> + (void __iomem *)_base; \
>> +})
>> +
>> #define UPDATE_STATS(largestat, newstat, oldstat) \
>> { \
>> if ((newstat) < (oldstat)) \
>> --
>> 2.7.4
>
> Wait, what does this patch on its own do? Why create this macro?
>
> greg k-h
>
