linux-kernel - Re: [PATCH] memblock: add memblock_start_of

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Date:	Mon, 8 Aug 2011 11:34:23 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] memblock: add memblock_start_of_DRAM()

(cc'ing hpa and quoting whole body)

On Sat, Aug 06, 2011 at 08:59:23PM +0200, Sam Ravnborg wrote:
> SPARC32 require access to the start address.
> Add a new helper memblock_start_of_DRAM() to give
> access to the address of the first memblock - which
> contains the lowest address.
> 
> The ackward name was chosen to match the already present
> memblock_end_of_DRAM().
> 
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Yinghai Lu <yinghai@...nel.org>
> ---
> Hi Tejun.
> 
> I have started to replace bootmem with memblock for sparc32.
> This is so far the only general functionality missing.
> 
> But conversion is not finished yet - more may come.
> 
> This is on top of the memblock branch of your misc tree

Yes, this looks good to me.

 Acked-by: Tejun Heo <tj@...nel.org>

hpa, how do you want to proceed with the patchset?

Thanks.

> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 7c59804..a6bb102 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -157,6 +157,7 @@ phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
>  phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
>  				  phys_addr_t max_addr);
>  phys_addr_t memblock_phys_mem_size(void);
> +phys_addr_t memblock_start_of_DRAM(void);
>  phys_addr_t memblock_end_of_DRAM(void);
>  void memblock_enforce_memory_limit(phys_addr_t memory_limit);
>  int memblock_is_memory(phys_addr_t addr);
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 07cb3ae..2f55f19 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -782,6 +782,12 @@ phys_addr_t __init memblock_phys_mem_size(void)
>  	return memblock.memory.total_size;
>  }
>  
> +/* lowest address */
> +phys_addr_t __init_memblock memblock_start_of_DRAM(void)
> +{
> +	return memblock.memory.regions[0].base;
> +}
> +
>  phys_addr_t __init_memblock memblock_end_of_DRAM(void)
>  {
>  	int idx = memblock.memory.cnt - 1;

-- 
tejun
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