linux-kernel - Re: [PATCH] rtc: pl030: Use devm

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Date:	Thu, 10 Oct 2013 16:14:00 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"sangjung.woo" <sangjung.woo@...sung.com>,
	Alessandro Rubini <rubini@...dd.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] rtc: pl030: Use devm_kzalloc() instead of kmalloc()

On Thu, 2013-10-10 at 16:06 -0700, Andrew Morton wrote:
> On Tue, 08 Oct 2013 21:59:27 -0700 Joe Perches <joe@...ches.com> wrote:
> 
> > I was a bit surprised to find there isn't a devm_kmalloc.
> 
> Yes, the unconditional memset is silly.  Especially when the
> function has a handy gfp_t and could be passed __GFP_ZERO.
> 
> The comment says "managed kzalloc/kfree for device drivers, no kmalloc,
> always use kzalloc".  There's no explanation for this - it looks like
> some ideological thing.

Try this patch instead:
https://lkml.org/lkml/2013/10/9/14

Yours has an unnecessary duplicate memset of the whole
block when __GFP_ZERO is passed when that's already
done by the kmalloc_track_caller allocator.

Also if __GFP_ZERO is not passed, you should still
zero the struct devres header.


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