linux-kernel - Re: [PATCH 1/4] lib: make test_bitops compilable into the kernel image

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Date: Fri, 3 May 2024 08:13:05 -0700
From: Yury Norov <yury.norov@...il.com>
To: Kuan-Wei Chiu <visitorckw@...il.com>
Cc: linux-kernel@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/4] lib: make test_bitops compilable into the kernel
 image

On Fri, May 03, 2024 at 10:24:23AM +0800, Kuan-Wei Chiu wrote:
> On Thu, May 02, 2024 at 07:14:10PM -0700, Yury Norov wrote:
> > On Fri, May 03, 2024 at 10:00:07AM +0800, Kuan-Wei Chiu wrote:
> > > On Thu, May 02, 2024 at 04:32:01PM -0700, Yury Norov wrote:
> > > > The test is limited to be compiled as a module. There's no technical
> > > > reason for it. Now that the test bears performance benchmark, it would
> > > > be reasonable to allow running it at kernel load time, before userspace
> > > > starts, to reduce possible jitter.
> > > > 
> > > > Signed-off-by: Yury Norov <yury.norov@...il.com>
> > > > ---
> > > >  lib/Kconfig.debug | 1 -
> > > >  1 file changed, 1 deletion(-)
> > > > 
> > > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > > > index c63a5fbf1f1c..fc8fe1ea5b49 100644
> > > > --- a/lib/Kconfig.debug
> > > > +++ b/lib/Kconfig.debug
> > > > @@ -2436,7 +2436,6 @@ config TEST_LKM
> > > >  
> > > >  config TEST_BITOPS
> > > >  	tristate "Test module for compilation of bitops operations"
> > > > -	depends on m
> > > 
> > > 
> > > Perhaps it would be better to modify the description in the following
> > > help section at the same time?
> > 
> > What exactly you want to change?
> >
> It seems to me that the entire description is written specifically for
> the module. For instance, "doesn't run or load unless explicitly
> requested by name. for example: modprobe test_bitops." In my view, this
> description is no longer accurate.

In-kernel module is still module. Everything is the same as for .ko,
except that it's loaded automatically and earlier for you. To me this
part of the description is correct.

If you feel it should be reworded - feel free to submit a patch. Now
that we add more functionality in that, it's probably worth to do. Not
in this series, though.

Thanks,
Yury