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

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Message-ID: <20140612051853.GD12415@bbox>
Date:	Thu, 12 Jun 2014 14:18:53 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	kvm@...r.kernel.org, linux-mm@...ck.org,
	Gleb Natapov <gleb@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Graf <agraf@...e.de>, kvm-ppc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/10] DMA, CMA: clean-up log message

Hi Joonsoo,

On Thu, Jun 12, 2014 at 12:21:38PM +0900, Joonsoo Kim wrote:
> 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().

When I take a look, it just indicates cma_activate_area was called or not,
without what range for the area was reserved successfully so I couldn't see
the intention for new message. Description should explain it so that everybody
can agree on your claim.

> 
> 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);
>  
>  		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__);
>  
> +	cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
>  	if (!cma->bitmap)
>  		return -ENOMEM;
>  
> @@ -234,7 +235,8 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
>  
>  	/* Sanity checks */
>  	if (cma_area_count == ARRAY_SIZE(cma_areas)) {
> -		pr_err("Not enough slots for CMA reserved regions!\n");
> +		pr_err("%s(): Not enough slots for CMA reserved regions!\n",
> +			__func__);
>  		return -ENOSPC;
>  	}
>  
> @@ -274,14 +276,15 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
>  	*res_cma = cma;
>  	cma_area_count++;
>  
> -	pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M,
> -		(unsigned long)base);
> +	pr_info("%s(): reserved %ld MiB at %08lx\n",
> +		__func__, (unsigned long)size / SZ_1M, (unsigned long)base);
>  
>  	/* Architecture specific contiguous memory fixup. */
>  	dma_contiguous_early_fixup(base, size);
>  	return 0;
>  err:
> -	pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
> +	pr_err("%s(): failed to reserve %ld MiB\n",
> +		__func__, (unsigned long)size / SZ_1M);
>  	return ret;
>  }
>  
> -- 
> 1.7.9.5

-- 
Kind regards,
Minchan Kim
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