From: Dan Williams <dan.j.williams@intel.com>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: "linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5/8] dax: refactor locking out of size calculation routines
Date: Wed, 14 Dec 2016 07:55:31 -0800 [thread overview]
Message-ID: <CAPcyv4iwOtW69u+tAs9oXYJD2EEFcA3tzFZVK5NNS8EwFezyjg@mail.gmail.com> (raw)
In-Reply-To: <20161214150130.GE6279@linux-x5ow.site>
On Wed, Dec 14, 2016 at 7:01 AM, Johannes Thumshirn <jthumshirn@suse.de> wrote:
> Hi Dan,
>
> On Sat, Dec 10, 2016 at 10:28:51PM -0800, Dan Williams wrote:
>> In preparation for other callers of these routines make the locking the
>> responsibility of the caller.
>>
>> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
>> ---
>> drivers/dax/dax.c | 30 ++++++++++++++++++++++++------
>> 1 file changed, 24 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
>> index d878a56cf3e3..5b65eaff6ace 100644
>> --- a/drivers/dax/dax.c
>> +++ b/drivers/dax/dax.c
>> @@ -90,11 +90,11 @@ static unsigned long long dax_region_avail_size(
>> unsigned long long size;
>> struct resource *res;
>>
>> - mutex_lock(&dax_region->lock);
>> + WARN_ON_ONCE(!mutex_is_locked(&dax_region->lock));
>
> I'd prefer it a lockdep_assert_held(&dex_region->lock). This of cause has the
> drawback that it won't trigger w/o lockdep but enabled, but I don't think it's
> the responibility of a production kernel to have this warnings anyway. On the
> flip side you get all the lockdep beauty for free with it.
True, yes, it's only a developer debug warning. I'll change it and fix
up the other pattern like this in libnvdimm.
next prev parent reply other threads:[~2016-12-14 16:05 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-11 6:28 [PATCH 0/8] device-dax: sub-division support Dan Williams
2016-12-11 6:28 ` [PATCH 1/8] dax: add region-available-size attribute Dan Williams
2016-12-14 14:38 ` Johannes Thumshirn
2016-12-14 15:53 ` Dan Williams
2016-12-15 6:47 ` Dan Williams
2016-12-11 6:28 ` [PATCH 2/8] dax: add region 'id', 'size', and 'align' attributes Dan Williams
2016-12-11 6:28 ` [PATCH 3/8] dax: register seed device Dan Williams
2016-12-11 6:28 ` [PATCH 4/8] dax: use multi-order radix for resource lookup Dan Williams
2016-12-11 6:28 ` [PATCH 5/8] dax: refactor locking out of size calculation routines Dan Williams
2016-12-14 15:01 ` Johannes Thumshirn
2016-12-14 15:55 ` Dan Williams [this message]
2016-12-11 6:28 ` [PATCH 6/8] dax: sub-division support Dan Williams
2016-12-11 6:29 ` [PATCH 7/8] dax: add / remove dax devices after provisioning Dan Williams
2016-12-11 6:29 ` [PATCH 8/8] dax: add debug for region available_size Dan Williams
2016-12-12 17:15 ` [PATCH 0/8] device-dax: sub-division support Jeff Moyer
2016-12-12 18:46 ` Dan Williams
2016-12-13 23:46 ` Jeff Moyer
2016-12-14 1:17 ` Dan Williams
2016-12-15 16:50 ` Jeff Moyer
2016-12-15 23:48 ` Dan Williams
2016-12-16 2:33 ` Dan Williams
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