linux-kernel - Re: [PATCH v3] arm64: Add support for PTE contiguous bit.

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Date:	Fri, 20 Nov 2015 11:20:49 -0500
From:	David Woods <dwoods@...hip.com>
To:	yalin wang <yalin.wang2010@...il.com>
CC:	<catalin.marinas@....com>, <will.deacon@....com>,
	<steve.capper@...aro.org>, <jeremy.linton@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<cmetcalf@...hip.com>
Subject: Re: [PATCH v3] arm64: Add support for PTE contiguous bit.

On 11/20/2015 05:07 AM, yalin wang wrote:
>> +
>> +void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
>> +			    pte_t *ptep, pte_t pte)
>> +{
>> +	size_t pgsize;
>> +	int i;
>> +	int ncontig = find_num_contig(mm, addr, ptep, pte, &pgsize);
>> +	unsigned long pfn;
>> +	pgprot_t hugeprot;
>> +
>> +	if (ncontig == 1) {
>> +		set_pte_at(mm, addr, ptep, pte);
>> +		return;
>> +	}
>> +
>> +	pfn = pte_pfn(pte);
>> +	hugeprot = __pgprot(pte_val(pfn_pte(pfn, 0) ^ pte_val(pte)));
> is this should be pte_val(pfn_pte(pfn, 0)) ^ pte_val(pte)  ?
>
The code generated is identical either way, but I agree your way looks 
better.

-Dave

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