Re: [net PATCH] net: phy: aquantia: fix wrong GENMASK define for LED_PROV_ACT_STRETCH

[Christophe JAILLET <christophe.jaillet@wanadoo.fr>]

Le 11/05/2025 à 11:57, Russell King (Oracle) a écrit :
> On Sun, May 11, 2025 at 11:06:17AM +0200, Christian Marangi wrote:
>> In defining VEND1_GLOBAL_LED_PROV_ACT_STRETCH there was a typo where the
>> GENMASK definition was swapped.
>>
>> Fix it to prevent any kind of misconfiguration if ever this define will
>> be used in the future.
> 
> I thought GENMASK() was supposed to warn about this kind of thing. I've
> questioned in the past whether GENMASK() is better than defining fields
> with hex numbers, and each time I see another repeat of this exact case,
> I re-question whether GENMASK() actually gives much benefit over hex
> numbers because it's just too easy to get the two arguments to
> GENMASK() swapped and it's never obvious that's happened.
> 
> I don't remember there being a dribble of patches in the past
> correcting bitfields defined using hex numbers, but that seems common
> with GENMASK().
> 

There is a compile time check, but in this case
VEND1_GLOBAL_LED_PROV_ACT_STRETCH looks unused. So it is never expanded 
and compiled.

CJ