how to check regmap start address

Greg KH greg at
Thu Apr 2 08:14:56 EDT 2020

On Thu, Apr 02, 2020 at 01:48:23PM +0200, Tomek The Messenger wrote:
> Hi
> Let's see how it looks:
> 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?


greg k-h

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