linux-kernel - Re: [PATCH 17/20] [SCSI] mpt3sas: Use alloc_ordered_workqueue() API instead of create_singlethread

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Date:	Tue, 16 Jun 2015 10:33:51 +0530
From:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Joe Lawrence <joe.lawrence@...atus.com>,
	"jejb@...nel.org" <jejb@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Sathya Prakash <Sathya.Prakash@...gotech.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 17/20] [SCSI] mpt3sas: Use alloc_ordered_workqueue() API
 instead of create_singlethread_workqueue() API

On Tue, Jun 16, 2015 at 2:35 AM, James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
> On Mon, 2015-06-15 at 16:26 +0530, Sreekanth Reddy wrote:
>> On Sat, Jun 13, 2015 at 2:33 AM, Joe Lawrence <joe.lawrence@...atus.com> wrote:
>> > On 06/12/2015 05:42 AM, Sreekanth Reddy wrote:
>> > ...
>> >> +#if defined(alloc_ordered_workqueue)
>> >> +     ioc->firmware_event_thread = alloc_ordered_workqueue(
>> >> +             ioc->firmware_event_name, WQ_MEM_RECLAIM);
>> >> +#else
>> >> +             ioc->firmware_event_thread = create_singlethread_workqueue(
>> >>           ioc->firmware_event_name);
>> >> +#endif
>> >
>> > Hi Sreekanth,
>> >
>> > I think the upstream version of this code can safely assume
>> > alloc_ordered_workqueue is defined, no?
>>
>> yes, upstream version of this code can safely assume that
>> alloc_ordered_workqueue is defined.
>>
>> While working in-house, I observed that some of the older kernels
>> doesn't defined this macro, so I have added this else section.
>
> The driver has to be defined for the current kernel.  If you maintain a
> backport, that's fine, but not in the upstream driver.  The reasons are
> fairly pragmatic: this code in the #else clause can't be compiled so
> it's just junk to the upstream driver and the static checkers will find
> it and you'll attract a flock of patches removing dead code.
>
Accepted. I will post next version of this patch by removing the else section.

Thanks,
Sreekanth


> James
>
>



-- 

Regards,
Sreekanth
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