linux-kernel - Re: [PATCH 02/21] memblock, numa: Introduce flag into memblock.

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Date:	Tue, 23 Jul 2013 15:09:28 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, trenn@...e.de, yinghai@...nel.org,
	jiang.liu@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	mgorman@...e.de, minchan@...nel.org, mina86@...a86.com,
	gong.chen@...ux.intel.com, vasilis.liaskovitis@...fitbricks.com,
	lwoodman@...hat.com, riel@...hat.com, jweiner@...hat.com,
	prarit@...hat.com, zhangyanfei@...fujitsu.com,
	yanghy@...fujitsu.com, x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 02/21] memblock, numa: Introduce flag into memblock.

Hello,

On Fri, Jul 19, 2013 at 03:59:15PM +0800, Tang Chen wrote:
> +#define MEMBLK_FLAGS_DEFAULT	0x0	/* default flag */

Please don't do this.  Just clearing the struct as zero is enough.

> @@ -439,12 +449,14 @@ repeat:
>  int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
>  				       int nid)
>  {
> -	return memblock_add_region(&memblock.memory, base, size, nid);
> +	return memblock_add_region(&memblock.memory, base, size,
> +				   nid, MEMBLK_FLAGS_DEFAULT);

And just use zero for no flag.  Doing something like the above gets
weird with actual flags.  e.g. if you add a flag, say, MEMBLK_HOTPLUG,
should it be MEMBLK_FLAGS_DEFAULT | MEMBLK_HOTPLUG or just
MEMBLK_HOTPLUG?  If latter, the knowledge that DEFAULT is zero is
implicit, and, if so, why do it at all?

> +static int __init_memblock memblock_reserve_region(phys_addr_t base,
> +						   phys_addr_t size,
> +						   int nid,
> +						   unsigned long flags)
>  {
>  	struct memblock_type *_rgn = &memblock.reserved;
>  
> -	memblock_dbg("memblock_reserve: [%#016llx-%#016llx] %pF\n",
> +	memblock_dbg("memblock_reserve: [%#016llx-%#016llx] with flags %#016lx %pF\n",

Let's please drop "with" and do we really need to print full 16
digits?

Thanks.

-- 
tejun
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