linux-kernel - Re: [PATCH v1 1/2] kunit: add macro to allow conditionally exposing static symbols to tests

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Date:   Mon, 21 Nov 2022 22:13:54 -0800
From:   John Johansen <john.johansen@...onical.com>
To:     Rae Moar <rmoar@...gle.com>, brendanhiggins@...gle.com,
        davidgow@...gle.com, dlatypov@...gle.com
Cc:     skhan@...uxfoundation.org, tales.aparecida@...il.com,
        kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, apparmor@...ts.ubuntu.com
Subject: Re: [PATCH v1 1/2] kunit: add macro to allow conditionally exposing
 static symbols to tests

On 11/2/22 10:59, Rae Moar wrote:
> Create two macros:
> 
> VISIBLE_IF_KUNIT - A macro that sets symbols to be static if CONFIG_KUNIT
> is not enabled. Otherwise if CONFIG_KUNIT is enabled there is no change
> to the symbol definition.
> 
> EXPORT_SYMBOL_IF_KUNIT(symbol) - Exports symbol into
> EXPORTED_FOR_KUNIT_TESTING namespace only if CONFIG_KUNIT is enabled. Must
> use MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING) in test file in order to
> use symbols.
> 
> Signed-off-by: Rae Moar <rmoar@...gle.com>

This looks fine
Reviewed-by: John Johansen <john.johansen@...onical.com>

> ---
>   include/kunit/visibility.h | 32 ++++++++++++++++++++++++++++++++
>   1 file changed, 32 insertions(+)
>   create mode 100644 include/kunit/visibility.h
> 
> diff --git a/include/kunit/visibility.h b/include/kunit/visibility.h
> new file mode 100644
> index 000000000000..eb22c9e6b4eb
> --- /dev/null
> +++ b/include/kunit/visibility.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * KUnit API to allow symbols to be conditionally visible during KUnit
> + * testing
> + *
> + * Copyright (C) 2019, Google LLC.
> + * Author: Brendan Higgins <brendanhiggins@...gle.com>
> + */
> +
> +#ifndef _KUNIT_VISIBILITY_H
> +#define _KUNIT_VISIBILITY_H
> +
> +/**
> + * VISIBLE_IF_KUNIT - A macro that sets symbols to be static if CONFIG_KUNIT
> + * is not enabled. Otherwise if CONFIG_KUNIT is enabled there is no change
> + * to the symbol definition.
> + *
> + * EXPORT_SYMBOL_IF_KUNIT(symbol) - Exports symbol into
> + * EXPORTED_FOR_KUNIT_TESTING namespace only if CONFIG_KUNIT is
> + * enabled. Must use MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING)
> + * in test file in order to use symbols.
> + */
> +#if IS_ENABLED(CONFIG_KUNIT)
> +    #define VISIBLE_IF_KUNIT
> +    #define EXPORT_SYMBOL_IF_KUNIT(symbol) EXPORT_SYMBOL_NS(symbol, \
> +	    EXPORTED_FOR_KUNIT_TESTING)
> +#else
> +    #define VISIBLE_IF_KUNIT static
> +    #define EXPORT_SYMBOL_IF_KUNIT(symbol)
> +#endif
> +
> +#endif /* _KUNIT_VISIBILITY_H */