# Re: \[RFC\]\[PATCH 03/12\] digest\_lists: Basic definitions

- From: Matthew Wilcox \<willy@infradead.org\>
- Date: 2021-06-27 15:24:02 
- List: linux-doc
- Page: https://ratatoskr.run/linux-doc/2021/06/1426872
- Thread: https://ratatoskr.run/linux-integrity/2021/06/1426231/t.md

```text
On Sun, Jun 27, 2021 at 12:53:47PM +0200, Greg KH wrote:
> > +enum ops { DIGEST_LIST_ADD, DIGEST_LIST_DEL, DIGEST_LIST_OP__LAST };
> > +
> 
> For enums you export to userspace, you need to specify the values so
> that all compilers get them right.

I've never heard that rule before.  Where does it come from?
https://en.cppreference.com/w/c/language/enum
says:

  If enumeration-constant is not followed by = constant-expression,
  its value is the value one greater than the value of the previous
  enumerator in the same enumeration. The value of the first enumerator
  (if it does not use = constant-expression) is zero.

```