linux-kernel - Re: [PATCH v5 1/2] lib/test_bitops: Add benchmark test for fns()

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Date: Mon, 6 May 2024 10:52:09 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: Yury Norov <yury.norov@...il.com>, Miguel Ojeda <ojeda@...nel.org>,
	Kuan-Wei Chiu <visitorckw@...il.com>,
	kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] lib/test_bitops: Add benchmark test for fns()

On Sun, May 05, 2024 at 12:42:50PM +0200, Miguel Ojeda wrote:
> On Sat, May 4, 2024 at 12:23 AM Nathan Chancellor <nathan@...nel.org> wrote:
> > One gotcha that might be worth mentioning is that this combination only
> > works on functions and non-local variables (i.e., static or global).
> 
> Yeah, since the `unused` one only applies to that, right?

No, unused can be used with local variables, used cannot.

https://godbolt.org/z/1hroMGzb1

Cheers,
Nathatn