linux-kernel - Re: Weirdness in __alloc_bootmem_node

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Date:	Fri, 20 Apr 2012 12:30:54 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Tejun Heo <tj@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Weirdness in __alloc_bootmem_node_high

On Fri, Apr 20, 2012 at 12:14 PM, Sam Ravnborg <sam@...nborg.org> wrote:
>
> I took a quick look at this.
> __alloc_bootmem_node_high() is used in mm/sparse.c - but only
> if SPARSEMEM_VMEMMAP is enabled.
>
> mips has this:
>
> config ARCH_SPARSEMEM_ENABLE
>        bool
>        select SPARSEMEM_STATIC
>
> So SPARSEMEM_VMEMMAP is not enabled.
>
> __alloc_bootmem_node_high() is used in mm/sparse-vmemmap.c which
> also depends on CONFIG_SPARSEMEM_VMEMMAP.
>
>
> So I really do not see the logic in __alloc_bootmem_node_high()
> being used anymore and it can be replaced by __alloc_bootmem_node()

Yes, you are right. __alloc_bootmem_node_high could be removed.

BTW, x86 is still the only one that use NO_BOOTMEM.

Are you working on making sparc to use NO_BOOTMEM?

Yinghai
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