Re: [PATCH 2/9] fs: fix empty-body warning in posix_acl.c

[Randy Dunlap]

On 4/18/20 11:53 AM, Linus Torvalds wrote:
> On Sat, Apr 18, 2020 at 11:41 AM Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
>>
>> Fix gcc empty-body warning when -Wextra is used:
> 
> Please don't do this.
> 
> First off, "do_empty()" adds nothing but confusion. Now it
> syntactically looks like it does something, and it's a new pattern to
> everybody. I've never seen it before.
> 
> Secondly, even if we were to do this, then the patch would be wrong:
> 
>>         if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
>> -               /* fall through */ ;
>> +               do_empty(); /* fall through */
> 
> That comment made little sense before, but it makes _no_ sense now.
> 
> What fall-through? I'm guessing it meant to say "nothing", and
> somebody was confused. With "do_empty()", it's even more confusing.
> 
> Thirdly, there's a *reason* why "-Wextra" isn't used.
> 
> The warnings enabled by -Wextra are usually complete garbage, and
> trying to fix them often makes the code worse. Exactly like here.

OK, no problem.  That's why PATCH 0/9 says RFC.

Oops. Crap. It was *supposed* to say RFC. :(

-- 
~Randy