linux-kernel - Re: [BUGFIX] [PATCH v2] x86: update all PGDs for direct mapping changes on 64bit.

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Date:	Wed, 19 May 2010 19:51:04 +0800
From:	Haicheng Li <haicheng.li@...ux.intel.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"dnelson@...hat.com" <dnelson@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Li, Haicheng" <haicheng.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [BUGFIX] [PATCH v2] x86: update all PGDs for direct mapping	changes
 on 64bit.

I'm sorry for my slow response ...

Wu Fengguang wrote:
 >> +static void sync_global_pgds(unsigned long start, unsigned long end)
 >
 > It seems that this function can reuse code with vmalloc_sync_all().

agreed.

 > __init_extra_mapping() is not related to memory hotplug (note: the
 > __init prefix), so not necessary to change this function?

yes, I think you are right. We don't need to change __init_extra_mapping().

 >>   vmemmap_populate(struct page *start_page, unsigned long size, int node)
 > It's not necessary to introduce the "start" and "err" variables.
 > It helps simplify the patch (or you can put them to another cleanup
 > only patch).

ok, let's make the fix as simple as possible.

I'll send out the revised version right now. Thank you for the review.

-haicheng
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