Re: [PATCH] lib/list-test: add a test for the 'list' doubly linked list

[Brendan Higgins]

On Mon, Oct 07, 2019 at 02:36:33PM -0700, David Gow wrote:
> This change adds a KUnit test for the kernel doubly linked list
> implementation in include/linux/list.h
> 
> Note that, at present, it only tests the list_ types (not the
> singly-linked hlist_), and does not yet test all of the
> list_for_each_entry* macros (and some related things like
> list_prepare_entry).
> 
> This change depends on KUnit, so should be merged via the 'test' branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=test

Others might feel differently than me, but I think this should go in the
comment section (below the "---").

> Signed-off-by: David Gow <davidgow@xxxxxxxxxx>

Reviewed-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Tested-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>

> ---
>  lib/Kconfig.debug |  12 +
>  lib/Makefile      |   3 +
>  lib/list-test.c   | 711 ++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 726 insertions(+)
>  create mode 100644 lib/list-test.c
> 
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index a3017a5dadcd..60691c0aac3e 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1961,6 +1961,18 @@ config SYSCTL_KUNIT_TEST
>  
>  	  If unsure, say N.
>  
> +config LIST_TEST
> +	bool "KUnit Test for Kernel Linked-list stuctures"
> +	depends on KUNIT
> +	help
> +	  This builds the linked list unit test, which runs on boot.
> +	  It tests that the API and basic functionality of the list_head type
> +	  and associated macros.
> +	  For more information on KUnit and unit tests in general please refer
> +	  to the KUnit documentation in Documentation/dev-tools/kunit/.
> +
> +	  If unsure, say N.
> +
>  config TEST_UDELAY
>  	tristate "udelay test driver"
>  	help
> diff --git a/lib/Makefile b/lib/Makefile
> index bba1fd5485f7..309e174ee35d 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -292,3 +292,6 @@ obj-$(CONFIG_GENERIC_LIB_MULDI3) += muldi3.o
>  obj-$(CONFIG_GENERIC_LIB_CMPDI2) += cmpdi2.o
>  obj-$(CONFIG_GENERIC_LIB_UCMPDI2) += ucmpdi2.o
>  obj-$(CONFIG_OBJAGG) += objagg.o
> +
> +# KUnit tests
> +obj-$(CONFIG_LIST_TEST) += list-test.o
> diff --git a/lib/list-test.c b/lib/list-test.c
> new file mode 100644
> index 000000000000..f333e8b0d9fe
> --- /dev/null
> +++ b/lib/list-test.c
> @@ -0,0 +1,711 @@
> +// SPDX-License-Identifier: GPL-2.0

Might also want to add a bit more of a description here. Even if it is
just something like "KUnit test for the doubly linked list data
structure."

Also:

/*
 * <Insert description here.>
 *
 * Copyright (C) 2019, Google LLC.
 * Author: David Gow <davidgow@xxxxxxxxxx>
 */

> +#include <kunit/test.h>
> +
> +#include <linux/list.h>
> +
> +struct list_test_struct {
> +	int data;
> +	struct list_head list;
> +};

<snip>

Thanks!