From: Brendan Higgins <brendanhiggins@google.com>
To: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Frank Rowand <frowand.list@gmail.com>,
Kees Cook <keescook@google.com>,
Luis Chamberlain <mcgrof@kernel.org>,
shuah@kernel.org, Rob Herring <robh@kernel.org>,
Kieran Bingham <kieran.bingham@ideasonboard.com>,
Greg KH <gregkh@linuxfoundation.org>,
Joel Stanley <joel@jms.id.au>,
Michael Ellerman <mpe@ellerman.id.au>,
Joe Perches <joe@perches.com>,
brakmo@fb.com, Steven Rostedt <rostedt@goodmis.org>,
"Bird, Timothy" <Tim.Bird@sony.com>,
Kevin Hilman <khilman@baylibre.com>,
Julia Lawall <julia.lawall@lip6.fr>,
linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
linux-um@lists.infradead.org, Daniel Vetter <daniel@ffwll.ch>,
dri-devel <dri-devel@lists.freedesktop.org>,
Dan Williams <dan.j.williams@intel.com>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Knut Omang <knut.omang@oracle.com>,
devicetree <devicetree@vger.kernel.org>,
Petr Mladek <pmladek@suse.com>,
Sasha Levin <Alexander.Levin@microsoft.com>,
Amir Goldstein <amir73il@gmail.com>,
dan.carpenter@oracle.com, wfg@linux.intel.com
Subject: Re: [RFC v4 00/17] kunit: introduce KUnit, the Linux kernel unit testing framework
Date: Wed, 27 Feb 2019 20:18:46 -0800 [thread overview]
Message-ID: <CAFd5g450Vy73fR5mfbuZe=KUzsFD=NAbg40GbuVmJg2udp3tmQ@mail.gmail.com> (raw)
In-Reply-To: <871s3zeeay.fsf@morokweng.localdomain>
On Fri, Feb 22, 2019 at 12:53 PM Thiago Jung Bauermann
<bauerman@linux.ibm.com> wrote:
>
>
> Frank Rowand <frowand.list@gmail.com> writes:
>
> > On 2/19/19 10:34 PM, Brendan Higgins wrote:
> >> On Mon, Feb 18, 2019 at 12:02 PM Frank Rowand <frowand.list@gmail.com> wrote:
> >> <snip>
> >>> I have not read through the patches in any detail. I have read some of
> >>> the code to try to understand the patches to the devicetree unit tests.
> >>> So that may limit how valid my comments below are.
> >>
> >> No problem.
> >>
> >>>
> >>> I found the code difficult to read in places where it should have been
> >>> much simpler to read. Structuring the code in a pseudo object oriented
> >>> style meant that everywhere in a code path that I encountered a dynamic
> >>> function call, I had to go find where that dynamic function call was
> >>> initialized (and being the cautious person that I am, verify that
> >>> no where else was the value of that dynamic function call). With
> >>> primitive vi and tags, that search would have instead just been a
> >>> simple key press (or at worst a few keys) if hard coded function
> >>> calls were done instead of dynamic function calls. In the code paths
> >>> that I looked at, I did not see any case of a dynamic function being
> >>> anything other than the value it was originally initialized as.
> >>> There may be such cases, I did not read the entire patch set. There
> >>> may also be cases envisioned in the architects mind of how this
> >>> flexibility may be of future value. Dunno.
> >>
> >> Yeah, a lot of it is intended to make architecture specific
> >> implementations and some other future work easier. Some of it is also
> >> for testing purposes. Admittedly some is for neither reason, but given
> >> the heavy usage elsewhere, I figured there was no harm since it was
> >> all private internal usage anyway.
> >>
> >
> > Increasing the cost for me (and all the other potential code readers)
> > to read the code is harm.
>
> Dynamic function calls aren't necessary for arch-specific
> implementations either. See for example arch_kexec_image_load() in
> kernel/kexec_file.c, which uses a weak symbol that is overriden by
> arch-specific code. Not everybody likes weak symbols, so another
> alternative (which admitedly not everybody likes either) is to use a
> macro with the name of the arch-specific function, as used by
> arch_kexec_post_alloc_pages() in <linux/kexec.h> for instance.
I personally have a strong preference for dynamic function calls over
weak symbols or macros, but I can change it if it really makes
anyone's eyes bleed.
next prev parent reply other threads:[~2019-02-28 4:19 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 21:37 [RFC v4 00/17] kunit: introduce KUnit, the Linux kernel unit testing framework Brendan Higgins
2019-02-14 21:37 ` [RFC v4 01/17] kunit: test: add KUnit test runner core Brendan Higgins
2019-02-14 21:37 ` [RFC v4 02/17] kunit: test: add test resource management API Brendan Higgins
2019-02-15 21:01 ` Stephen Boyd
2019-02-19 23:24 ` Brendan Higgins
2019-02-14 21:37 ` [RFC v4 03/17] kunit: test: add string_stream a std::stream like string builder Brendan Higgins
2019-02-14 21:37 ` [RFC v4 04/17] kunit: test: add test_stream a std::stream like logger Brendan Higgins
2019-02-14 21:37 ` [RFC v4 05/17] kunit: test: add the concept of expectations Brendan Higgins
2019-02-14 21:37 ` [RFC v4 06/17] kbuild: enable building KUnit Brendan Higgins
2019-02-14 21:37 ` [RFC v4 07/17] kunit: test: add initial tests Brendan Higgins
2019-02-14 21:37 ` [RFC v4 08/17] kunit: test: add support for test abort Brendan Higgins
2019-02-18 19:52 ` Frank Rowand
2019-02-20 3:39 ` Brendan Higgins
2019-02-20 6:44 ` Frank Rowand
2019-02-28 7:42 ` Brendan Higgins
2019-03-22 1:09 ` Frank Rowand
2019-03-22 1:41 ` Brendan Higgins
2019-03-22 7:10 ` Knut Omang
2019-03-25 22:32 ` Brendan Higgins
2019-03-26 7:44 ` Knut Omang
2019-02-26 20:35 ` Stephen Boyd
2019-02-28 9:03 ` Brendan Higgins
2019-02-28 13:54 ` Dan Carpenter
2019-03-04 22:28 ` Brendan Higgins
[not found] ` <155137694423.260864.2846034318906225490@swboyd.mtv.corp.google.com>
2019-03-04 22:39 ` Brendan Higgins
2019-02-14 21:37 ` [RFC v4 09/17] kunit: test: add the concept of assertions Brendan Higgins
2019-02-14 21:37 ` [RFC v4 10/17] kunit: test: add test managed resource tests Brendan Higgins
2019-02-15 20:54 ` Stephen Boyd
2019-02-19 23:20 ` Brendan Higgins
2019-02-14 21:37 ` [RFC v4 11/17] kunit: tool: add Python wrappers for running KUnit tests Brendan Higgins
2019-02-14 21:37 ` [RFC v4 12/17] kunit: defconfig: add defconfigs for building " Brendan Higgins
2019-02-14 21:37 ` [RFC v4 13/17] Documentation: kunit: add documentation for KUnit Brendan Higgins
2019-02-14 21:37 ` [RFC v4 14/17] MAINTAINERS: add entry for KUnit the unit testing framework Brendan Higgins
2019-02-14 21:37 ` [RFC v4 15/17] of: unittest: migrate tests to run on KUnit Brendan Higgins
2019-02-16 0:24 ` Frank Rowand
2019-02-20 2:24 ` Brendan Higgins
2019-02-14 21:37 ` [RFC v4 16/17] of: unittest: split out a couple of test cases from unittest Brendan Higgins
2019-03-22 1:14 ` Frank Rowand
2019-03-22 1:45 ` Brendan Higgins
2019-02-14 21:37 ` [RFC v4 17/17] of: unittest: split up some super large test cases Brendan Higgins
2019-03-22 1:16 ` Frank Rowand
2019-03-22 1:45 ` Brendan Higgins
2019-02-18 20:02 ` [RFC v4 00/17] kunit: introduce KUnit, the Linux kernel unit testing framework Frank Rowand
2019-02-20 6:34 ` Brendan Higgins
2019-02-20 6:46 ` Frank Rowand
2019-02-22 20:52 ` Thiago Jung Bauermann
2019-02-28 4:18 ` Brendan Higgins [this message]
2019-02-28 4:15 ` Brendan Higgins
2019-03-04 23:01 ` Brendan Higgins
2019-03-22 1:23 ` Frank Rowand
2019-03-25 22:11 ` Brendan Higgins
2019-03-21 1:07 ` Logan Gunthorpe
2019-03-21 5:23 ` Knut Omang
2019-03-21 15:56 ` Logan Gunthorpe
2019-03-21 16:55 ` Brendan Higgins
2019-03-21 19:13 ` Knut Omang
2019-03-21 19:29 ` Logan Gunthorpe
2019-03-21 20:14 ` Knut Omang
2019-03-21 22:07 ` Brendan Higgins
2019-03-21 22:26 ` Logan Gunthorpe
2019-03-21 23:33 ` Brendan Higgins
2019-03-22 1:12 ` Frank Rowand
2019-03-25 22:12 ` Brendan Higgins
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