Re: [PATCH v5 3/3] overflow: Introduce wrapping_inc() and wrapping_dec()

[Andy Shevchenko]

On Wed, Feb 7, 2024 at 5:24 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>
> This allows replacements of the idioms "var += offset" and "var -= offset"
> with the wrapping_inc() and wrapping_dec() helpers respectively. They
> will avoid wrap-around sanitizer instrumentation.
>
> Add to the selftests to validate behavior and lack of side-effects.

I would expect inc/dec to add/subtract 1. So, to me the terminology is
confusing. The list of the C/C++ operators on Wikipedia describes
above as

+= Assignment by sum
-= Assignment by difference


Hence the proposal is to have

wrapping_sum()
wrapping_diff()

-- 
With Best Regards,
Andy Shevchenko