linux-kernel - Re: [PATCH v5, part4 16/41] mm/blackfin: prepare for removing num_physpages and simplify mem

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Date:	Sat, 25 May 2013 21:25:47 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	David Rientjes <rientjes@...gle.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	David Howells <dhowells@...hat.com>,
	Mark Salter <msalter@...hat.com>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-arch@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Mike Frysinger <vapier@...too.org>,
	Bob Liu <lliubbo@...il.com>,
	uclinux-dist-devel <uclinux-dist-devel@...ckfin.uclinux.org>
Subject: Re: [PATCH v5, part4 16/41] mm/blackfin: prepare for removing
 num_physpages and simplify mem_init()

Hi Jiang

On Wed, May 8, 2013 at 11:51 PM, Jiang Liu <liuj97@...il.com> wrote:
> Prepare for removing num_physpages and simplify mem_init().
>
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Cc: Mike Frysinger <vapier@...too.org>
> Cc: Bob Liu <lliubbo@...il.com>
> Cc: uclinux-dist-devel@...ckfin.uclinux.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  arch/blackfin/mm/init.c |   38 ++++++--------------------------------
>  1 file changed, 6 insertions(+), 32 deletions(-)
>
> diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
> index 1cc8607..e4b6e11 100644
> --- a/arch/blackfin/mm/init.c
> +++ b/arch/blackfin/mm/init.c
> @@ -90,43 +90,17 @@ asmlinkage void __init init_pda(void)
>
>  void __init mem_init(void)
>  {
> -       unsigned int codek = 0, datak = 0, initk = 0;
> -       unsigned int reservedpages = 0, freepages = 0;
> -       unsigned long tmp;
> -       unsigned long start_mem = memory_start;
> -       unsigned long end_mem = memory_end;
> +       char buf[64];
>
> -       end_mem &= PAGE_MASK;
> -       high_memory = (void *)end_mem;
> -
> -       start_mem = PAGE_ALIGN(start_mem);
> -       max_mapnr = num_physpages = MAP_NR(high_memory);
> -       printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
> +       high_memory = (void *)(memory_end & PAGE_MASK);
> +       max_mapnr = MAP_NR(high_memory);
> +       printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", max_mapnr);
>
>         /* This will put all low memory onto the freelists. */
>         free_all_bootmem();
>
> -       reservedpages = 0;
> -       for (tmp = ARCH_PFN_OFFSET; tmp < max_mapnr; tmp++)
> -               if (PageReserved(pfn_to_page(tmp)))
> -                       reservedpages++;
> -       freepages =  max_mapnr - ARCH_PFN_OFFSET - reservedpages;
> -
> -       /* do not count in kernel image between _rambase and _ramstart */
> -       reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
> -#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)
> -       reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
> -#endif
> -
> -       codek = (_etext - _stext) >> 10;
> -       initk = (__init_end - __init_begin) >> 10;
> -       datak = ((_ramstart - _rambase) >> 10) - codek - initk;
> -
> -       printk(KERN_INFO
> -            "Memory available: %luk/%luk RAM, "
> -               "(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
> -               (unsigned long) freepages << (PAGE_SHIFT-10), (_ramend - CONFIG_PHY_RAM_BASE_ADDRESS) >> 10,
> -               initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));

You can't remove all these memory information for blackfin. They are
useful on blackfin platform.

Regards,

Sonic
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