linux-kernel - Re: [lustre-devel] [PATCH] staging: lustre: Handle nodemask on UMP machines

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Date:	Tue, 22 Dec 2015 00:30:24 +0000
From:	"Dilger, Andreas" <andreas.dilger@...el.com>
To:	James Simmons <jsimmons@...radead.org>
CC:	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	James Simmons <uja.ornl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Drokin, Oleg" <oleg.drokin@...el.com>,
	"lustre-devel@...ts.lustre.org" <lustre-devel@...ts.lustre.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: Re: [lustre-devel] [PATCH] staging: lustre: Handle nodemask on UMP
 machines

On 2015/12/21, 15:08, "lustre-devel on behalf of Greg Kroah-Hartman"
<lustre-devel-bounces@...ts.lustre.org on behalf of
gregkh@...uxfoundation.org> wrote:

>On Sun, Nov 08, 2015 at 11:34:55AM -0500, James Simmons wrote:
>> For UMP and SMP machines the struct cfs_cpt_table are
>> defined differently. In the case handled by this patch
>> nodemask is defined as a integer for the UMP case and
>> as a pointer for the SMP case. This will cause a problem
>> for ost_setup which reads the nodemask directly. Instead
>> we create a UMP version of cfs_cpt_nodemask and use that
>> in ost_setup.
>> 
>> Signed-off-by: James Simmons <uja.ornl@...il.com>
>> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4199
>> Reviewed-on: http://review.whamcloud.com/9219
>> Reviewed-by: Liang Zhen <liang.zhen@...el.com>
>> Reviewed-by: Li Xi <pkuelelixi@...il.com>
>> Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
>> 
>> Starting in 3.14 kernels nodemask_t was changed from a
>> a unsigned long to a linux bitmap so more than 32 cores
>> could be supported. Using set_bit in cfs_cpt_table_alloc
>> no longer compiles so this patch backports bits of the
>> node management function that use a linux bitmap back
>> end. Cleaned up libcfs bitmap.h to use the libcfs layers
>> memory allocation function. This was pulling in lustre
>> related code that was not defined.
>> 
>> Signed-off-by: James Simmons <uja.ornl@...il.com>
>> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4993
>> Reviewed-on: http://review.whamcloud.com/10332
>> Reviewed-by: Liang Zhen <liang.zhen@...el.com>
>> Reviewed-by: Bob Glossman <bob.glossman@...el.com>
>> Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
>
>What is with this crazy two sections of signed-off-by?  If this was 2
>patches, make it two patches.
>
>If not, then don't do this.
>
>Also, this whole series had no numbering, so I don't know how to apply
>them, please fix and resend it.

I suspect that this is merging two separate patches so that they do not
introduce a regression when landed to master.  In the past you've said
you wanted fix patches merged into the original patch for this reason.

I guess the right thing to do is to merge the Signed-off-by: lines at
the end of the combined patch, rather than just mashing the commit
messages together.

Cheers, Andreas
-- 
Andreas Dilger

Lustre Principal Architect
Intel High Performance Data Division


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