linux-kernel - Re: [PATCH] x86: split e820 reserved entries record to late v3

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Message-ID: <alpine.LFD.1.10.0808281750520.3300@nehalem.linux-foundation.org>
Date:	Thu, 28 Aug 2008 17:53:45 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: split e820 reserved entries record to late v3



On Thu, 28 Aug 2008, Yinghai Lu wrote:
>  /*
>   * Mark e820 reserved areas as busy for the resource manager.
>   */
> +struct resource __initdata *e820_res;

Btw, make this one "static" - I don't think anybody outside of this file 
should ever use it anyway.

And this:

> +		if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20))
> +			insert_resource(&iomem_resource, res);

is probably worthy of a comment. 

And finally:

> +void __init e820_reserve_resources_late(void)
> +{
> +	int i;
> +	struct resource *res;
> +
> +	res = e820_res;
> +	for (i = 0; i < e820.nr_map; i++) {
> +		if (e820.map[i].type == E820_RESERVED && res->start >= (1ULL<<20))
> +			insert_resource(&iomem_resource, res);

instead of duplicating the conditional and always having to worry about it 
matching, how about just making it

		if (!res->parent)
			insert_resource(&iomem_resource, res);

which basically says that "if it's not already inserted, try to re-insert 
it now".

		Linus
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