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Subject: Re: linux-next: build failure after merge of the scsi-mkp tree
To:     Stephen Rothwell <sfr@canb.auug.org.au>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Douglas Gilbert <dgilbert@interlog.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
References: <20210312141744.0022d5f5@canb.auug.org.au>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <d5200097-771d-b565-dabf-0aad3fc2ea8d@kernel.dk>
Date:   Thu, 11 Mar 2021 20:20:32 -0700
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On 3/11/21 8:17 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the scsi-mkp tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
> 
> 
> drivers/scsi/sg.c: In function 'sg_mk_kern_bio':
> drivers/scsi/sg.c:2958:17: error: 'BIO_MAX_PAGES' undeclared (first use in this function); did you mean 'BIO_MAX_VECS'?
>  2958 |  if (bvec_cnt > BIO_MAX_PAGES)
>       |                 ^~~~~~~~~~~~~
>       |                 BIO_MAX_VECS
> 
> Caused by commit
> 
>   b32ac463cb59 ("scsi: sg: NO_DXFER move to/from kernel buffers")
> 
> interacting with commit
> 
>   a8affc03a9b3 ("block: rename BIO_MAX_PAGES to BIO_MAX_VECS")
> 
> from the block tree.
> 
> I have applied the following merge fix patch:
> 
> From: Stephen Rothwell <sfr@canb.auug.org.au>
> Date: Fri, 12 Mar 2021 14:11:16 +1100
> Subject: [PATCH] scsi: sg: fix up for BIO_MAX_PAGES rename
> 
> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
> ---
>  drivers/scsi/sg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
> index 2d4bbc1a1727..6b31b2bc8f9a 100644
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -2955,7 +2955,7 @@ sg_mk_kern_bio(int bvec_cnt)
>  {
>  	struct bio *biop;
>  
> -	if (bvec_cnt > BIO_MAX_PAGES)
> +	if (bvec_cnt > BIO_MAX_VECS)
>  		return NULL;
>  	biop = bio_alloc(GFP_ATOMIC, bvec_cnt);
>  	if (!biop)

Looks good - fwiw, the block change will go into 5.12-rc3 to avoid
having this issue over a merge window prep, so maybe SCSI can pull
in -rc3 and get this resolved locally in that tree.

I'll rebase the block-5.12 branch off -rc1 after this merge.

-- 
Jens Axboe