linux-kernel - Re: [RFC v1 3/6] kunit: test: create a single centralized executor for all tests

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Date:   Tue, 17 Dec 2019 00:04:07 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>,
        akpm@...ux-foundation.org, alan.maguire@...cle.com,
        anton.ivanov@...bridgegreys.com, arnd@...db.de,
        davidgow@...gle.com, jdike@...toit.com, keescook@...omium.org,
        richard@....at, rppt@...ux.ibm.com, skhan@...uxfoundation.org,
        yzaikin@...gle.com
Cc:     gregkh@...uxfoundation.org, logang@...tatee.com, mcgrof@...nel.org,
        knut.omang@...cle.com, linux-um@...ts.infradead.org,
        linux-arch@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        Brendan Higgins <brendanhiggins@...gle.com>
Subject: Re: [RFC v1 3/6] kunit: test: create a single centralized executor for all tests

Quoting Brendan Higgins (2019-12-16 14:05:52)
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index dba48304b3bd3..c070798ebb765 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -217,11 +217,8 @@ int kunit_run_tests(struct kunit_suite *suite);
>   * everything else is definitely initialized.
>   */
>  #define kunit_test_suite(suite)                                                       \
> -       static int kunit_suite_init##suite(void)                               \

Oh this should have been __init before.

> -       {                                                                      \
> -               return kunit_run_tests(&suite);                                \
> -       }                                                                      \
> -       late_initcall(kunit_suite_init##suite)
> +       static struct kunit_suite *__kunit_suite_##suite                       \
> +       __used __aligned(8) __section(.kunit_test_suites) = &suite
>  
>  /*
>   * Like kunit_alloc_resource() below, but returns the struct kunit_resource
> diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> new file mode 100644
> index 0000000000000..978086cfd257d
> --- /dev/null
> +++ b/lib/kunit/executor.c
> @@ -0,0 +1,43 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Base unit test (KUnit) API.
> + *
> + * Copyright (C) 2019, Google LLC.
> + * Author: Brendan Higgins <brendanhiggins@...gle.com>
> + */
> +
> +#include <linux/init.h>
> +#include <linux/printk.h>
> +#include <kunit/test.h>
> +
> +/*
> + * These symbols point to the .kunit_test_suites section and are defined in
> + * include/asm-generic/vmlinux.lds.h, and consequently must be extern.
> + */
> +extern struct kunit_suite *__kunit_suites_start[];
> +extern struct kunit_suite *__kunit_suites_end[];
> +
> +static bool kunit_run_all_tests(void)

Should be __init?

> +{
> +       struct kunit_suite **suite;

Can this be const? And the linker references above too?

> +       bool has_test_failed = false;
> +
> +       for (suite = __kunit_suites_start;
> +            suite < __kunit_suites_end;
> +            ++suite) {
> +               if (kunit_run_tests(*suite))
> +                       has_test_failed = true;
> +       }
> +
> +       return !has_test_failed;
> +}
> +
> +static int kunit_executor_init(void)

Should be __init?

> +{
> +       if (kunit_run_all_tests())
> +               return 0;
> +       else
> +               return -EFAULT;

Why two functions instead of just one that is the target of the
late_initcall? Nitpick: deindent that last return and take it out of the
else.

> +}
> +
> +late_initcall(kunit_executor_init);