From: Bart Van Assche <bvanassche@acm.org>
To: Damien Le Moal <Damien.LeMoal@wdc.com>, Jens Axboe <axboe@kernel.dk>
Cc: "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Ming Lei <ming.lei@redhat.com>,
Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
Alexander Potapenko <glider@google.com>
Subject: Re: [PATCH 5/5] null_blk: Zero-initialize read buffers in non-memory-backed mode
Date: Sun, 17 May 2020 19:56:37 -0700 [thread overview]
Message-ID: <45f9df39-a62e-4721-5bc8-ac9fa87b02ea@acm.org> (raw)
In-Reply-To: <BY5PR04MB690032A546EF80F2B823C984E7B80@BY5PR04MB6900.namprd04.prod.outlook.com>
On 2020-05-17 19:10, Damien Le Moal wrote:
> On 2020/05/18 10:32, Bart Van Assche wrote:
>> On 2020-05-17 18:12, Damien Le Moal wrote:
>>> On 2020/05/16 9:19, Bart Van Assche wrote:
>>>> +static void nullb_zero_rq_data_buffer(const struct request *rq)
>>>> +{
>>>> + struct req_iterator iter;
>>>> + struct bio_vec bvec;
>>>> +
>>>> + rq_for_each_bvec(bvec, rq, iter)
>>>> + zero_fill_bvec(&bvec);
>>>> +}
>>>> +
>>>> +static void nullb_zero_read_cmd_buffer(struct nullb_cmd *cmd)
>>>> +{
>>>> + struct nullb_device *dev = cmd->nq->dev;
>>>> +
>>>> + if (dev->queue_mode == NULL_Q_BIO && bio_op(cmd->bio) == REQ_OP_READ)
>>>> + zero_fill_bio(cmd->bio);
>>>> + else if (req_op(cmd->rq) == REQ_OP_READ)
>>>> + nullb_zero_rq_data_buffer(cmd->rq);
>>>> +}
>>>
>>> Shouldn't the definition of these two functions be under a "#ifdef CONFIG_KMSAN" ?
>>
>> It is on purpose that I used IS_ENABLED(CONFIG_KMSAN) below instead of
>> #ifdef CONFIG_KMSAN. CONFIG_KMSAN is not yet upstream and I want to
>> expose the above code to the build robot.
>
> But then you will get a "defined but unused" build warning, no ?
Not when using IS_ENABLED(...).
Bart.
next prev parent reply other threads:[~2020-05-18 2:56 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-16 0:19 [PATCH 0/5] Block layer patches for kernel v5.8 Bart Van Assche
2020-05-16 0:19 ` [PATCH 1/5] block: Fix type of first compat_put_{,u}long() argument Bart Van Assche
2020-05-16 7:40 ` Arnd Bergmann
2020-05-16 12:41 ` Christoph Hellwig
2020-05-16 0:19 ` [PATCH 2/5] bio.h: Declare the arguments of bio iteration functions const Bart Van Assche
2020-05-16 8:55 ` Alexander Potapenko
2020-05-16 17:10 ` Bart Van Assche
2020-05-16 12:42 ` Christoph Hellwig
2020-05-17 22:46 ` Chaitanya Kulkarni
2020-05-16 0:19 ` [PATCH 3/5] block: Document the bio_vec properties Bart Van Assche
2020-05-16 12:43 ` Christoph Hellwig
2020-05-16 0:19 ` [PATCH 4/5] block: Fix zero_fill_bio() Bart Van Assche
2020-05-16 5:50 ` Ming Lei
2020-05-16 0:19 ` [PATCH 5/5] null_blk: Zero-initialize read buffers in non-memory-backed mode Bart Van Assche
2020-05-16 9:40 ` Alexander Potapenko
2020-05-18 1:12 ` Damien Le Moal
2020-05-18 1:32 ` Bart Van Assche
2020-05-18 2:10 ` Damien Le Moal
2020-05-18 2:56 ` Bart Van Assche [this message]
2020-05-18 3:12 ` Damien Le Moal
2020-05-18 14:31 ` Bart Van Assche
2020-05-19 3:03 ` Damien Le Moal
2020-05-19 4:10 ` Bart Van Assche
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