linux-kernel - Re: [PATCH] scsi: core: Make scsi_lib KUnit tests modular for real

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Date: Tue, 19 Mar 2024 17:10:59 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Bart Van Assche <bvanassche@....org>
Cc: Mike Christie <michael.christie@...cle.com>, 
	"James E . J . Bottomley" <jejb@...ux.ibm.com>, "Martin K . Petersen" <martin.petersen@...cle.com>, 
	Lukas Bulwahn <lukas.bulwahn@...il.com>, linux-scsi@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: core: Make scsi_lib KUnit tests modular for real

Hoi Bart,

On Tue, Mar 19, 2024 at 5:03 PM Bart Van Assche <bvanassche@....org> wrote:
> On 3/19/24 05:02, Geert Uytterhoeven wrote:
> > While SCSI_LIB_KUNIT_TEST is a tristate config symbol, configuring a
> > modular build of this test does not do anything: as the test code is
> > just included by the mid layer code, it only works in the built-in case.
> >
> > Fix this by converting the test to a stand-alone module.  This requires
> > exporting scsi_check_passthrough() and adding a MODULE_LICENSE() tag.
>
> I don't like it that scsi_check_passthrough() is exported so that counts
> as a disadvantage of this patch. Why to convert scsi_lib_test into a

Perhaps the exported symbol should be __scsi_check_passthrough(),
to make it clearer this is not meant for general use?

> kernel module? What are the advantages compared to the current approach?
> That information is missing from the patch description.

SCSI_LIB_KUNIT_TEST is already tristate, so the original author must
have meant it to be modular.  Or perhaps he just copied it from
(most/all) other tests ;-)

Anyway, I find it very useful to be able to do "modprobe kunit" and
"modprobe <test>" to run a test when I feel the need to do so.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds