linux-kernel - Re: [RFC v3 PATCH 04/10] mm/hugetlb: expose hugetlb fault mutex for use by fallocate

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Message-ID: <555F630D.4090706@oracle.com>
Date:	Fri, 22 May 2015 10:10:37 -0700
From:	Mike Kravetz <mike.kravetz@...cle.com>
To:	Davidlohr Bueso <dave@...olabs.net>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	David Rientjes <rientjes@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC v3 PATCH 04/10] mm/hugetlb: expose hugetlb fault mutex for
 use by fallocate

On 05/22/2015 10:01 AM, Davidlohr Bueso wrote:
> On Thu, 2015-05-21 at 08:47 -0700, Mike Kravetz wrote:
>> +/*
>> + * Interfaces to the fault mutex routines for use by hugetlbfs
>> + * fallocate code.  Faults must be synchronized with page adds or
>> + * deletes by fallocate.  fallocate only deals with shared mappings.
>> + */
>> +u32 hugetlb_fault_mutex_shared_hash(struct address_space *mapping, pgoff_t idx)
>> +{
>> +	return fault_mutex_hash(NULL, NULL, NULL, mapping, idx, 0);
>> +}
>> +
>> +void hugetlb_fault_mutex_lock(u32 hash)
>> +{
>> +	mutex_lock(&htlb_fault_mutex_table[hash]);
>> +}
>> +
>> +void hugetlb_fault_mutex_unlock(u32 hash)
>> +{
>> +	mutex_unlock(&htlb_fault_mutex_table[hash]);
>> +}+
>
> These should really be inlined -- maybe add them to hugetlb.h along with
> the mutex hashtable bits.

Thanks.  I'll figure out some way to inline them in the next version
of the patch set.

-- 
Mike Kravetz

>
> Thanks,
> Davidlohr
>
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