linux-kernel - Re: [PATCH 2/3] x86, mm: Don't clear page table if next range is ram

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Date:	Tue, 9 Oct 2012 18:00:12 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] x86, mm: Don't clear page table if next range is ram

On Tue, Oct 9, 2012 at 8:46 AM, Konrad Rzeszutek Wilk <konrad@...nel.org> wrote:
>> +                         !e820_any_mapped(addr & PAGE_MASK, next, 0))
>
> What is the 0 parameter for?

any type

if type != 0, the will only check entries with same type.

int
e820_any_mapped(u64 start, u64 end, unsigned type)
{
        int i;

        for (i = 0; i < e820.nr_map; i++) {
                struct e820entry *ei = &e820.map[i];

                if (type && ei->type != type)
                        continue;
                if (ei->addr >= end || ei->addr + ei->size <= start)
                        continue;
                return 1;
        }
        return 0;
}
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