Re: [PATCH - resend] Memory-Hotplug: Fix the bug on interface/dev/mem for 64-bit kernel(v1)

[Wu Fengguang]

On Tue, Jan 12, 2010 at 09:50:12AM +0800, KAMEZAWA Hiroyuki wrote:

> Just an information.
> 
> We already check kenerke/resource.c's resource information, here.
> 
> read_mem()
> 	-> range_is_allowed()
> 		-> devmem_is_allowd()
> 			-> iomem_is_exclusive()
> 
> extra calls of page_is_ram() to ask architecture's map seems redundunt.
> 
> But, I know PPC guys doesn't use ioresource.c, hehe.

Another exception is !CONFIG_STRICT_DEVMEM, which makes
range_is_allowed()==1. So we still need the page_is_ram() :)

Thanks,
Fengguang

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