Messages in this thread | | | From | Linus Torvalds <> | Date | Sat, 18 Apr 2020 11:53:03 -0700 | Subject | Re: [PATCH 2/9] fs: fix empty-body warning in posix_acl.c |
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On Sat, Apr 18, 2020 at 11:41 AM Randy Dunlap <rdunlap@infradead.org> 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.
Linus
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