linux-kernel - Re: [RFC PATCH] device: Add kernel standard devm

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Date:	Wed, 09 Oct 2013 10:49:43 -0700
From:	Joe Perches <joe@...ches.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Sangjung Woo <sangjung.woo@...sung.com>
Subject: Re: [RFC PATCH] device: Add kernel standard devm_k.alloc functions

On Wed, 2013-10-09 at 12:30 -0400, Tejun Heo wrote:
> Hello,
> 
> On Wed, Oct 09, 2013 at 12:04:42AM -0700, Joe Perches wrote:
> > > > > > 	devm_kzalloc
> > > > > > 	devm_kcalloc
> > > > > > 	devm_kmalloc_array
> > > > > > 
> > > > > > Add gfp.h to device.h for the newly added static inlines.
> ...
> > Unless Tejun has an objection soon, yes.
> 
> Do we really need devm_kmalloc_array() for devm interface?  The
> reasonsing behind only having kzalloc was that it's not worthwhile
> skipping zeroing for stuff happening during driver init/exit paths.
> The resource management overhead itself is already significant and
> unscalable compared to the raw cost of alloc/free and the interface
> isn't supposed to be used in super-hot paths.  Shouldn't
> devm_kzalloc() and devm_kcalloc() be enough?

I think API symmetry is a good thing and I think
that API dissymmetry is not a good thing when the
creation and support cost is very low.


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