Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries

[PATCH 0/6] mremap fixes · Aneesh Kumar K.V <hidden> · 2021-06-10
[PATCH 1/6] selftest/mremap_test: Update the test to handle pagesize other than 4K · Aneesh Kumar K.V <hidden> · 2021-06-10
[PATCH 2/6] selftest/mremap_test: Avoid crash with static build · Aneesh Kumar K.V <hidden> · 2021-06-10
[PATCH 4/6] mm/mremap: Don't enable optimized PUD move if page table levels is 2 · Aneesh Kumar K.V <hidden> · 2021-06-10
[PATCH 3/6] mm/mremap: Convert huge PUD move to separate helper · Aneesh Kumar K.V <hidden> · 2021-06-10
Re: [PATCH 3/6] mm/mremap: Convert huge PUD move to separate helper · Hugh Dickins <hughd@google.com> · 2021-06-10
[PATCH 6/6] mm/mremap: hold the rmap lock in write mode when moving page table entries. · Aneesh Kumar K.V <hidden> · 2021-06-10
Re: [PATCH 6/6] mm/mremap: hold the rmap lock in write mode when moving page table entries. · Jann Horn <jannh@google.com> · 2021-06-11
[PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-06-10
Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Linus Torvalds <torvalds@linux-foundation.org> · 2021-06-10
Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-06-13
Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Matthew Wilcox <willy@infradead.org> · 2021-06-13
Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-06-13
Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Christophe Leroy <hidden> · 2021-06-14
Re: [PATCH 5/6] mm/mremap: Use pmd/pud_poplulate to update page table entries · Linus Torvalds <torvalds@linux-foundation.org> · 2021-06-13

From: Matthew Wilcox <willy@infradead.org>
Date: 2021-06-13 10:50:33
Also in: linux-mm

On Sun, Jun 13, 2021 at 02:36:13PM +0530, Aneesh Kumar K.V wrote:

IIUC the reason why we do have pmd_pgtable() is that pgtable_t type
is arch dependent. On some architecture it is pte_t * and on the other
struct page *. The reason being highmem and level 4 page table can
be located in highmem.

That is ahistorical.  See 2f569afd9ced9ebec9a6eb3dbf6f83429be0a7b4 --
we have pgtable_t for the benefit of s390's crazy sub-page page table
sizes.

Also, please stop numbering page tables upside down.  PTEs are first
level, not fourth.

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