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From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Ira Weiny <ira.weiny@intel.com>,
	linux-block@vger.kernel.org,
	Linux NVDIMM <nvdimm@lists.linux.dev>
Subject: Re: [PATCH 3/3] block: warn if ->groups is set when calling add_disk
Date: Tue, 21 Sep 2021 08:32:09 +0200	[thread overview]
Message-ID: <20210921063209.GA23736@lst.de> (raw)
In-Reply-To: <CAPcyv4iVL7bevm_MeFnkRK12SkwO4k5aR3-4KOAGMxThmJwOuA@mail.gmail.com>

On Mon, Sep 20, 2021 at 04:50:03PM -0700, Dan Williams wrote:
> >
> >         ddev->parent = parent;
> > -       ddev->groups = groups;
> > +       if (!WARN_ON_ONCE(ddev->groups))
> > +               ddev->groups = groups;
> 
> That feels too compact to me, and dev_WARN_ONCE() might save someone a
> git blame to look up the reason for the warning:
> 
>     dev_WARN_ONCE(parent, ddev->groups, "unexpected pre-populated
> attribute group\n");
>     if (!ddev->groups)
>         ddev->groups = groups;
> 
> ...but not a deal breaker. Either way you can add:
> 

I'd rather keep it simple and optmize for the normal case..

  reply	other threads:[~2021-09-21  6:32 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20  7:27 fix a dax/block device attribute registration regression Christoph Hellwig
2021-09-20  7:27 ` [PATCH 1/3] nvdimm/pmem: fix creating the dax group Christoph Hellwig
2021-09-20 22:52   ` Ira Weiny
2021-09-20 23:09   ` Dan Williams
2021-09-20  7:27 ` [PATCH 2/3] nvdimm/pmem: move dax_attribute_group from dax to pmem Christoph Hellwig
2021-09-20 18:00   ` kernel test robot
2021-09-20 23:29     ` Dan Williams
2021-09-20 22:51   ` Ira Weiny
2021-09-20 23:36     ` Dan Williams
2021-09-20 23:37   ` Dan Williams
2021-09-20  7:27 ` [PATCH 3/3] block: warn if ->groups is set when calling add_disk Christoph Hellwig
2021-09-20 22:52   ` Ira Weiny
2021-09-20 23:50   ` Dan Williams
2021-09-21  6:32     ` Christoph Hellwig [this message]
2021-09-22 18:33 fix a dax/block device attribute registration regression Christoph Hellwig
2021-09-22 18:33 ` [PATCH 3/3] block: warn if ->groups is set when calling add_disk Christoph Hellwig

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