how to check regmap start address

[Greg KH]

On Thu, Apr 02, 2020 at 01:48:23PM +0200, Tomek The Messenger wrote:
> Hi
> Let's see how it looks:
> https://github.com/u-boot/u-boot/blob/master/include/regmap.h
> 
> I first time ever see such thing like this:
> struct regmap_range {
> ulong start;
> ulong size;
> };
> struct regmap {
> enum regmap_endianness_t endianness;
> int range_count;
> struct regmap_range ranges[0];
> };
> 
> How I can get access to variable ranges it if is 0 size? Who develops this
> one and who reviewed:)

It is very common and standard C coding style.  It happens all the time
when you have a variable of unknown length at declaration time.

> Anyway If I have pointer to regmap can I check what is start variable in
> some other way?

What other way do you need to check it?

Why do you think the above code is incorrect?  What do you think it
should look like?

thanks,

greg k-h