linux-kernel - Re: [PATCH v2 29/76] ARC: Boot #1: low-level, setup

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Message-Id: <201301181445.39050.arnd@arndb.de>
Date:	Fri, 18 Jan 2013 14:45:38 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 29/76] ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem init

On Friday 18 January 2013, Vineet Gupta wrote:
> +       /* setup bootmem allocator */
> +       bootmap_sz = init_bootmem_node(NODE_DATA(0),
> +                                      first_free_pfn,/* bitmap start */
> +                                      min_low_pfn,   /* First pg to track */
> +                                      max_low_pfn);  /* Last pg to track */
> +
> +       /*
> +        * init_bootmem above marks all tracked Page-frames as inuse "allocated"
> +        * This includes pages occupied by kernel's elf segments.
> +        * Beyond that, excluding bootmem bitmap itself, mark the rest of
> +        * free-mem as "allocatable"
> +        */
> +       alloc_start = kernel_img_end + bootmap_sz;
> +       free_bootmem(alloc_start, end_mem - alloc_start);
> +
> +       memset(zones_size, 0, sizeof(zones_size));
> +       zones_size[ZONE_NORMAL] = num_physpages;
> +

IIRC, the bootmem allocator is no longer recommended for new architecture.
You should use the "memblock" interface instead, as arm64 and tile do.

I just saw that this is still listed as TODO for openrisc, sorry if I
put you on the wrong track there by recommending to copy from openrisc.

	Arnd
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