linux-kernel - Re: [PATCH 18/22] lmb: Add __free/__reserve/__clear_lmb_reserved_region

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Date:	Mon, 10 May 2010 16:18:10 +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 18/22] lmb: Add
 __free/__reserve/__clear_lmb_reserved_region_array()

On Sat, 2010-05-08 at 08:17 -0700, Yinghai Lu wrote:
> Seperate those three functions and could be shared by related callers.

You just created those functions, so why don't you create them the
"right way" in the first place ?

I still have issues with that anyways, but we'll come to that one
thing at a time.

Cheers,
Ben.


> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  mm/lmb.c |   63 +++++++++++++++++++++++++++++++++++--------------------------
>  1 files changed, 36 insertions(+), 27 deletions(-)
> 
> diff --git a/mm/lmb.c b/mm/lmb.c
> index c2c6bff..20befd3 100644
> --- a/mm/lmb.c
> +++ b/mm/lmb.c
> @@ -684,16 +684,41 @@ static __init struct range *find_range_array(int count)
>  }
>  
>  #ifdef CONFIG_NO_BOOTMEM
> -static void __init subtract_lmb_reserved(struct range *range, int az)
> +static void __init __free_lmb_reserved_region_array(void)
>  {
> -	int i, count;
> -	u64 final_start, final_end;
> -
>  #ifdef ARCH_DISCARD_LMB
>  	/* Take out region array itself at first*/
>  	if (lmb.reserved.region != lmb_reserved_region)
>  		lmb_free(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
>  #endif
> +}
> +static void __init __reserve_lmb_reserved_region_array(void)
> +{
> +#ifdef ARCH_DISCARD_LMB
> +	/* Put region array back ? */
> +	if (lmb.reserved.region != lmb_reserved_region)
> +		lmb_reserve(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
> +#endif
> +}
> +
> +static void __init __clear_lmb_reserved_region_array(void)
> +{
> +#ifdef ARCH_DISCARD_LMB
> +	memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
> +	lmb.reserved.region = NULL;
> +	lmb.reserved.nr_regions = 0;
> +	lmb.reserved.cnt = 0;
> +#endif
> +}
> +
> +static void __init subtract_lmb_reserved(struct range *range, int az)
> +{
> +	int i, count;
> +	u64 final_start, final_end;
> +
> +	/* Take out region array itself at first*/
> +	__free_lmb_reserved_region_array();
> +
>  	count  = lmb.reserved.cnt;
>  
>  	if (lmb_debug)
> @@ -709,11 +734,9 @@ static void __init subtract_lmb_reserved(struct range *range, int az)
>  			continue;
>  		subtract_range(range, az, final_start, final_end);
>  	}
> -#ifdef ARCH_DISCARD_LMB
> +
>  	/* Put region array back ? */
> -	if (lmb.reserved.region != lmb_reserved_region)
> -		lmb_reserve(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
> -#endif
> +	__reserve_lmb_reserved_region_array();
>  }
>  
>  int __init get_free_all_memory_range(struct range **rangep, int nodeid)
> @@ -738,15 +761,9 @@ int __init get_free_all_memory_range(struct range **rangep, int nodeid)
>  	subtract_lmb_reserved(range, count);
>  	nr_range = clean_sort_range(range, count);
>  
> -#ifdef ARCH_DISCARD_LMB
>  	/* Need to clear it ? */
> -	if (nodeid == MAX_NUMNODES) {
> -		memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
> -		lmb.reserved.region = NULL;
> -		lmb.reserved.nr_regions = 0;
> -		lmb.reserved.cnt = 0;
> -	}
> -#endif
> +	if (nodeid == MAX_NUMNODES)
> +		__clear_lmb_reserved_region_array();
>  
>  	*rangep = range;
>  	return nr_range;
> @@ -757,11 +774,8 @@ void __init lmb_to_bootmem(u64 start, u64 end)
>  	int i, count;
>  	u64 final_start, final_end;
>  
> -#ifdef ARCH_DISCARD_LMB
>  	/* Take out region array itself */
> -	if (lmb.reserved.region != lmb_reserved_region)
> -		lmb_free(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
> -#endif
> +	__free_lmb_reserved_region_array();
>  
>  	count  = lmb.reserved.cnt;
>  	if (lmb_debug)
> @@ -782,13 +796,8 @@ void __init lmb_to_bootmem(u64 start, u64 end)
>  		reserve_bootmem_generic(final_start, final_end - final_start, BOOTMEM_DEFAULT);
>  	}
>  
> -#ifdef ARCH_DISCARD_LMB
> -	/* Clear them to avoid misusing ? */
> -	memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
> -	lmb.reserved.region = NULL;
> -	lmb.reserved.nr_regions = 0;
> -	lmb.reserved.cnt = 0;
> -#endif
> +	/* Assume lmb_to_bootmem is only called one time */
> +	__clear_lmb_reserved_region_array();
>  }
>  #endif
>  


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