linux-kernel - Re: [PATCHv4 27/39] x86-64, mm: proper alignment mappings with hugepages

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Message-ID: <519BFBA9.7040007@sr71.net>
Date:	Tue, 21 May 2013 15:56:41 -0700
From:	Dave Hansen <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 27/39] x86-64, mm: proper alignment mappings with hugepages

On 05/11/2013 06:23 PM, Kirill A. Shutemov wrote:
> +static inline unsigned long mapping_align_mask(struct address_space *mapping)
> +{
> +	if (mapping_can_have_hugepages(mapping))
> +		return PAGE_MASK & ~HPAGE_MASK;
> +	return get_align_mask();
> +}

get_align_mask() appears to be a bit more complicated to me than just a
plain old mask.  Are you sure you don't need to pick up any of its
behavior for the mapping_can_have_hugepages() case?
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