Re: [PATCH 01/13] tools: disable -Wno-type-limits

[Andy Shevchenko]

On Tue, Mar 16, 2021 at 09:17:24AM +0100, Rasmus Villemoes wrote:
> On 16/03/2021 02.54, Yury Norov wrote:
> > GENMASK(h, l) may be passed with unsigned types. In such case, type-limits
> > warning is generated for example in case of GENMASK(h, 0).

...

> I don't like that kind of collateral damage. I seem to recall another
> instance where a macro was instead rewritten to avoid triggering the
> type-limits warning (with a comment explaining the uglyness). Something like
> 
> foo > bar      is the same as
> !(foo <= bar)  which is the same as
> !(foo == bar || foo < bar)
> 
> Dunno if that would work here, but if it did, it would have the bonus
> that when somebody builds the kernel proper with Wtype-limits enabled
> (maybe W=1 or W=2) there would be no false positives from GENMASK to
> wade through.
> 
> Alternatively, we really should consider making use of _Pragma to
> locally disable/re-enable certain warnings.

Rasmus, in the kernel the same was fixed as per 355a3587d4ca.
I don't know why tools should be different to that.

-- 
With Best Regards,
Andy Shevchenko