linux-kernel - Re: [PATCH 05/39] lmb: Seperate region array from lmb

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Date:	Tue, 13 Apr 2010 13:56:09 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 05/39] lmb: Seperate region array from lmb_region struct

On Thu, 2010-04-08 at 23:03 -0700, Yinghai Lu wrote:
> lmb_init() will connect them back.
> Add nr_regions in struct lmb_region to track region array size.
> 
> So later We can install dynamically allocated region array to that pointer
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

> ---
>  include/linux/lmb.h |    3 ++-
>  mm/lmb.c            |    9 ++++++++-
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/lmb.h b/include/linux/lmb.h
> index f3d1433..e14ea8d 100644
> --- a/include/linux/lmb.h
> +++ b/include/linux/lmb.h
> @@ -26,7 +26,8 @@ struct lmb_property {
>  struct lmb_region {
>  	unsigned long cnt;
>  	u64 size;
> -	struct lmb_property region[MAX_LMB_REGIONS+1];
> +	struct lmb_property *region;
> +	unsigned long nr_regions;
>  };
>  
>  struct lmb {
> diff --git a/mm/lmb.c b/mm/lmb.c
> index b1fc526..65b62dc 100644
> --- a/mm/lmb.c
> +++ b/mm/lmb.c
> @@ -18,6 +18,8 @@
>  #define LMB_ALLOC_ANYWHERE	0
>  
>  struct lmb lmb;
> +static struct lmb_property lmb_memory_region[MAX_LMB_REGIONS + 1];
> +static struct lmb_property lmb_reserved_region[MAX_LMB_REGIONS + 1];
>  
>  static int lmb_debug;
>  
> @@ -106,6 +108,11 @@ static void lmb_coalesce_regions(struct lmb_region *rgn,
>  
>  void __init lmb_init(void)
>  {
> +	lmb.memory.region   = lmb_memory_region;
> +	lmb.reserved.region = lmb_reserved_region;
> +	lmb.memory.nr_regions   = ARRAY_SIZE(lmb_memory_region);
> +	lmb.reserved.nr_regions = ARRAY_SIZE(lmb_reserved_region);
> +
>  	/* Create a dummy zero size LMB which will get coalesced away later.
>  	 * This simplifies the lmb_add() code below...
>  	 */
> @@ -169,7 +176,7 @@ static long lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
>  
>  	if (coalesced)
>  		return coalesced;
> -	if (rgn->cnt >= MAX_LMB_REGIONS)
> +	if (rgn->cnt > rgn->nr_regions)
>  		return -1;
>  
>  	/* Couldn't coalesce the LMB, so add it to the sorted table. */


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