linux-kernel - Re: [PATCH 3/5] nbd: use flags instead of bool

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Date:   Fri, 9 Sep 2016 07:55:52 -0600
From:   Jens Axboe <axboe@...com>
To:     Joe Perches <joe@...ches.com>, Josef Bacik <jbacik@...com>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>, <mpa@...gutronix.de>,
        <nbd-general@...ts.sourceforge.net>
Subject: Re: [PATCH 3/5] nbd: use flags instead of bool

On 09/08/2016 07:20 PM, Joe Perches wrote:
> On Thu, 2016-09-08 at 17:12 -0400, Josef Bacik wrote:
>> In preparation for some future changes, change a few of the state bools over to
>> normal bits to set/clear properly.
> []
>> diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
> []
>> @@ -41,8 +41,12 @@
>>
>>  #include <linux/nbd.h>
>>
>> +#define NBD_TIMEDOUT			0
>> +#define NBD_DISCONNECT_REQUESTED	1
>> +
>>  struct nbd_device {
>>  	u32 flags;
>> +	unsigned long runtime_flags;
>
> Better to use DECLARE_BITMAP

It's a few flags, we know it fits in a long. There's no point to using
anything but that, and set/test/clear_bit().

-- 
Jens Axboe