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

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Date: Sun, 5 May 2024 12:42:50 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Nathan Chancellor <nathan@...nel.org>
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 Sat, May 4, 2024 at 12:23 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> Adding Miguel as compiler attributes maintainer to make him aware of the
> change. I think it would be reasonable to have you take it through the
> bitops tree with your ack so that the test patch can make use of this as
> the fix for the robot's issue.

Thanks Nathan!

Acked-by: Miguel Ojeda <ojeda@...nel.org>

The new macro sounds OK to me. Perhaps we should add some docs to the
other two attributes about their relationship and/or the existence of
this new `__always_used` one (so that it is easier to find). And if
so, then perhaps the docs for `__always_used` can be simplified.

> 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?

Cheers,
Miguel