linux-kernel - Re: [PATCH v2 8/8] block: add WARN() in bio

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Message-ID: <a31c67fa-0731-898a-e8d2-b7203d116405@acm.org>
Date:   Thu, 25 Mar 2021 20:47:43 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Satya Tangirala <satyat@...gle.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>, Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH v2 8/8] block: add WARN() in bio_split() for sector
 alignment

On 3/25/21 2:26 PM, Satya Tangirala wrote:
> @@ -1458,6 +1458,7 @@ struct bio *bio_split(struct bio *bio, int sectors,
>  
>  	BUG_ON(sectors <= 0);
>  	BUG_ON(sectors >= bio_sectors(bio));
> +	WARN_ON(!IS_ALIGNED(sectors, bio_required_sector_alignment(bio)));

Please change this WARN_ON() into WARN_ON_ONCE() to prevent a storm of
call traces in the kernel log if this warning statement would be hit
repeatedly.

Thanks,

Bart.