linux-kernel - Re: [PATCH 4/5] block: turn bio_kmalloc into a simple kmalloc wrapper

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Message-ID: <yq1pmmvltea.fsf@ca-mkp.ca.oracle.com>
Date:   Tue, 08 Mar 2022 22:06:52 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, Coly Li <colyli@...e.de>,
        Mike Snitzer <snitzer@...hat.com>, Song Liu <song@...nel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Phillip Lougher <phillip@...ashfs.org.uk>,
        linux-block@...r.kernel.org, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
        linux-raid@...r.kernel.org, target-devel@...r.kernel.org,
        linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 4/5] block: turn bio_kmalloc into a simple kmalloc wrapper


Christoph,

> Remove the magic autofree semantics and require the callers to explicitly
> call bio_init to initialize the bio.
>
> This allows bio_free to catch accidental bio_put calls on bio_init()ed
> bios as well.

> -struct bio *bio_kmalloc(gfp_t gfp_mask, unsigned short nr_iovecs);
> +struct bio *bio_kmalloc(unsigned short nr_vecs, gfp_t gfp_mask);

I understand why you did it but this parameter reversal is a bit
scary. Hopefully gfp_t will cause any mistakes to be flagged.

Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering