linux-kernel - Re: linux-next: build failure after merge of the device-mapper tree

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Date:   Thu, 31 May 2018 08:10:42 -0400
From:   Mike Snitzer <snitzer@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Alasdair G Kergon <agk@...hat.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kent Overstreet <kent.overstreet@...il.com>
Subject: Re: linux-next: build failure after merge of the device-mapper tree

On Thu, May 31 2018 at 12:35am -0400,
Jens Axboe <axboe@...nel.dk> wrote:

> On May 30, 2018, at 10:23 PM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > 
> > Hi all,
> > 
> > After merging the device-mapper tree, today's linux-next build (x86_64
> > allmodconfig) failed like this:
> > 
> > drivers/md/dm-writecache.c: In function 'writecache_dtr':
> > drivers/md/dm-writecache.c:1799:3: error: implicit declaration of function 'bioset_free'; did you mean 'bvec_free'? [-Werror=implicit-function-declaration]
> >   bioset_free(wc->bio_set);
> >   ^~~~~~~~~~~
> >   bvec_free
> > drivers/md/dm-writecache.c: In function 'writecache_ctr':
> > drivers/md/dm-writecache.c:1929:17: error: implicit declaration of function 'bioset_create'; did you mean 'bioset_exit'? [-Werror=implicit-function-declaration]
> >   wc->bio_set = bioset_create(BIO_POOL_SIZE,
> >                 ^~~~~~~~~~~~~
> >                 bioset_exit
> > drivers/md/dm-writecache.c:1929:15: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
> >   wc->bio_set = bioset_create(BIO_POOL_SIZE,
> >               ^
> > 
> > Caused by commit
> > 
> >  2105231db61b ("dm: add writecache target")
> > 
> > interacting with commit
> > 
> >  dad08527525f ("block: Drop bioset_create()")
> > 
> > from the block tree.
> > 
> > Can we please consider not immediately dropping APIs if at all
> > possible. :-(
> 
> I’ll drop the last patch, we can do that at the end of the merge window instead. 
> 

FYI, I've since updated dm-writecache to use the new APIs

Mike