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Date: Wed, 19 May 2010 20:12:02 +0800
From: Wu Fengguang <fengguang.wu@intel.com>
To: Haicheng Li <haicheng.li@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
       Thomas Gleixner <tglx@linutronix.de>,
       "ak@linux.intel.com" <ak@linux.intel.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] x86, mem-hotplug: update all PGDs for direct
 mapping and vmemmap mapping changes on 64bit.
Message-ID: <20100519121202.GB23778@localhost>
References: <4BF3D15F.1000604@linux.intel.com>
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> @@ -1033,6 +1038,7 @@ vmemmap_populate(struct page *start_page, unsigned long size, int node)
>   		}
> 
>   	}
> +	sync_global_pgds((unsigned long)start_page, end);

Here you removed the tlb flush in the original patch. Is it safe to do so?

Thanks,
Fengguang