linux-kernel - Re: [PATCH 1/4] locking: Begin kselftests for ww

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Date:   Wed, 30 Nov 2016 09:00:47 +0100
From:   Nicolai Hähnle <nhaehnle@...il.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>,
        linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Maarten Lankhorst <dev@...ankhorst.nl>
Subject: Re: [PATCH 1/4] locking: Begin kselftests for ww_mutex

On 30.11.2016 01:35, Chris Wilson wrote:
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Maarten Lankhorst <dev@...ankhorst.nl>
> Cc: Nicolai Hähnle <nhaehnle@...il.com>
> ---
>  kernel/locking/Makefile        |   1 +
>  kernel/locking/test-ww_mutex.c | 137 +++++++++++++++++++++++++++++++++++++++++
>  lib/Kconfig.debug              |  10 +++
>  3 files changed, 148 insertions(+)
>  create mode 100644 kernel/locking/test-ww_mutex.c
>
> diff --git a/kernel/locking/Makefile b/kernel/locking/Makefile
> index 6f88e352cd4f..760158d9d98d 100644
> --- a/kernel/locking/Makefile
> +++ b/kernel/locking/Makefile
> @@ -28,3 +28,4 @@ obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
>  obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o
>  obj-$(CONFIG_QUEUED_RWLOCKS) += qrwlock.o
>  obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o
> +obj-$(CONFIG_WW_MUTEX_SELFTEST) += test-ww_mutex.o
> diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
> new file mode 100644
> index 000000000000..e94b807e06c2
> --- /dev/null
> +++ b/kernel/locking/test-ww_mutex.c
> @@ -0,0 +1,137 @@
> +/*
> + * Module-based API test facility for ww_mutexes
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, you can access it online at
> + * http://www.gnu.org/licenses/gpl-2.0.html.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/kthread.h>
> +#include <linux/ww_mutex.h>
> +#include <linux/completion.h>
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Intel Corporation");
> +
> +static DEFINE_WW_CLASS(ww_class);
> +
> +struct test_mutex {
> +	struct work_struct work;
> +	struct ww_mutex mutex;
> +	struct completion ready, go, done;
> +	unsigned flags;
> +#define TEST_AB_SPIN BIT(0)
> +#define TEST_AB_TRY BIT(1)
> +};


Is it common to put #defines inside structs like that? It looks odd to 
me. Apart from that, patches 1-4 all make sense to me.

Thanks,
Nicolai