linux-kernel - Re: [v3 2/4] ARM: dma-mapping: Refactor out to introduce __in_atomic

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Message-ID: <20120824.143955.659265444078193982.hdoyu@nvidia.com>
Date:	Fri, 24 Aug 2012 13:39:55 +0200
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
CC:	"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"chunsang.jeong@...aro.org" <chunsang.jeong@...aro.org>,
	Krishna Reddy <vdumpa@...dia.com>,
	"subashrp@...il.com" <subashrp@...il.com>,
	"minchan@...nel.org" <minchan@...nel.org>,
	"pullip.cho@...sung.com" <pullip.cho@...sung.com>
Subject: Re: [v3 2/4] ARM: dma-mapping: Refactor out to introduce
 __in_atomic_pool

Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote @ Fri, 24 Aug 2012 13:14:55 +0200:

> On Fri, Aug 24, 2012 at 11:29:03AM +0300, Hiroshi Doyu wrote:
> > Check the given range("start", "size") is included in "atomic_pool" or not.
> > 
> > Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
> > ---
> >  arch/arm/mm/dma-mapping.c |   25 +++++++++++++++++++------
> >  1 files changed, 19 insertions(+), 6 deletions(-)
> > 
> > diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> > index b14ee64..508fde1 100644
> > --- a/arch/arm/mm/dma-mapping.c
> > +++ b/arch/arm/mm/dma-mapping.c
> > @@ -501,19 +501,32 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page)
> >  	return ptr;
> >  }
> >  
> > +static bool __in_atomic_pool(void *start, size_t size)
> > +{
> > +	struct dma_pool *pool = &atomic_pool;
> > +	void *end = start + size;
> > +	void *pool_start = pool->vaddr;
> > +	void *pool_end = pool->vaddr + pool->size;
> > +
> > +	if (start < pool_start || start > pool_end)
> > +		return false;
> > +
> > +	if (end > pool_end) {
> > +		WARN(1, "freeing wrong coherent size from pool\n");
> 
> That does not tell what size or from what pool. Perhaps you should
> include some details, such as the 'size' value, the pool used, the
> range of the pool, etc. Something that will help _you_in the field
> be able to narrow down what might be wrong.

True. I'll.
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