linux-kernel - Re: [RFC 5/9] powerpc/mm: Split huge_pte

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Date:	Wed, 9 Mar 2016 14:57:29 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Cc:	hughd@...gle.com, kirill@...temov.name, n-horiguchi@...jp.nec.com,
	akpm@...ux-foundation.org, mgorman@...hsingularity.net,
	aneesh.kumar@...ux.vnet.ibm.com, mpe@...erman.id.au
Subject: Re: [RFC 5/9] powerpc/mm: Split huge_pte_offset function for BOOK3S
 64K

On 03/09/2016 04:10 AM, Anshuman Khandual wrote:
> Currently the 'huge_pte_offset' function has only one version for
> all the configuations and platforms. This change splits the function
> into two versions, one for 64K page size based BOOK3S implementation
> and the other one for everything else. This change is also one of the
> prerequisites towards enabling GENERAL_HUGETLB implementation for
> BOOK3S 64K based huge pages.

I think there's a bit of background missing here for random folks on
linux-mm to make sense of these patches.

What is BOOK3S and what does it mean for these patches?  Why is its 64K
page size implementation different than all the others?  Is there a 4K
page size BOOK3S?