linux-kernel - Re: [PATCH v2 01/10] DMA, CMA: clean-up log message

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Message-ID: <20140612055358.GA30128@js1304-P5Q-DELUXE>
Date:	Thu, 12 Jun 2014 14:53:58 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 01/10] DMA, CMA: clean-up log message

On Thu, Jun 12, 2014 at 10:11:19AM +0530, Aneesh Kumar K.V wrote:
> Joonsoo Kim <iamjoonsoo.kim@....com> writes:
> 
> > We don't need explicit 'CMA:' prefix, since we already define prefix
> > 'cma:' in pr_fmt. So remove it.
> >
> > And, some logs print function name and others doesn't. This looks
> > bad to me, so I unify log format to print function name consistently.
> >
> > Lastly, I add one more debug log on cma_activate_area().
> >
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> >
> > diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
> > index 83969f8..bd0bb81 100644
> > --- a/drivers/base/dma-contiguous.c
> > +++ b/drivers/base/dma-contiguous.c
> > @@ -144,7 +144,7 @@ void __init dma_contiguous_reserve(phys_addr_t limit)
> >  	}
> >
> >  	if (selected_size && !dma_contiguous_default_area) {
> > -		pr_debug("%s: reserving %ld MiB for global area\n", __func__,
> > +		pr_debug("%s(): reserving %ld MiB for global area\n", __func__,
> >  			 (unsigned long)selected_size / SZ_1M);
> 
> Do we need to do function(), or just function:. I have seen the later
> usage in other parts of the kernel.

Hello,

I also haven't seen this format in other kernel code, but, in cma, they use
this format as following.

function(arg1, arg2, ...): some message

If we all dislike this format, we can change it after merging this
patchset. Until then, it seems better to me to leave it as is.

> 
> >
> >  		dma_contiguous_reserve_area(selected_size, selected_base,
> > @@ -163,8 +163,9 @@ static int __init cma_activate_area(struct cma *cma)
> >  	unsigned i = cma->count >> pageblock_order;
> >  	struct zone *zone;
> >
> > -	cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
> > +	pr_debug("%s()\n", __func__);
> 
> why ?
> 

This pr_debug() comes from ppc kvm's kvm_cma_init_reserved_areas().
I want to maintain all log messages as much as possible to reduce confusion
with this generalization.

Thanks.
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