linux-kernel - Re: [PATCH v3 11/11] md/raid5-ppl: Fix argument order in bio_alloc

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Date:   Thu, 2 Jun 2022 23:45:12 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Donald Buczek <buczek@...gen.mpg.de>,
        Guoqing Jiang <guoqing.jiang@...ux.dev>,
        Xiao Ni <xni@...hat.com>, Stephen Bates <sbates@...thlin.com>,
        Martin Oliveira <Martin.Oliveira@...eticom.com>,
        David Sloan <David.Sloan@...eticom.com>
Subject: Re: [PATCH v3 11/11] md/raid5-ppl: Fix argument order in
 bio_alloc_bioset()

On Thu, Jun 02, 2022 at 12:18:17PM -0600, Logan Gunthorpe wrote:
> bio_alloc_bioset() takes a block device, number of vectors, the
> OP flags, the GFP mask and the bio set. However when the prototype
> was changed, the callisite in ppl_do_flush() had the OP flags and
> the GFP flags reversed. This introduced some sparse error:
> 
>   drivers/md/raid5-ppl.c:632:57: warning: incorrect type in argument 3
> 				    (different base types)
>   drivers/md/raid5-ppl.c:632:57:    expected unsigned int opf
>   drivers/md/raid5-ppl.c:632:57:    got restricted gfp_t [usertype]
>   drivers/md/raid5-ppl.c:633:61: warning: incorrect type in argument 4
>   				    (different base types)
>   drivers/md/raid5-ppl.c:633:61:    expected restricted gfp_t [usertype]
> 				    gfp_mask
>   drivers/md/raid5-ppl.c:633:61:    got unsigned long long
> 
> The sparse error introduction may not have been reported correctly by
> 0day due to other work that was cleaning up other sparse errors in this
> area.
> 
> Fixes: 609be1066731 ("block: pass a block_device and opf to bio_alloc_bioset")
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>

Ooops.  Looks good:

Reviewed-by: Christoph Hellwig <hch@....de>

(and should probably be first in the series)