Re: [PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole

[PATCH 00/13] Convert x86 & arm64 to use generic page walk · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 01/13] arm64: mm: Add p?d_large() definitions · Steven Price <steven.price@arm.com> · 2019-02-15
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Mark Rutland <Mark.Rutland@arm.com> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Peter Zijlstra <peterz@infradead.org> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Steven Price <steven.price@arm.com> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Mark Rutland <mark.rutland@arm.com> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Peter Zijlstra <peterz@infradead.org> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Steven Price <steven.price@arm.com> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Mark Rutland <mark.rutland@arm.com> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Steven Price <steven.price@arm.com> · 2019-02-18
Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions · Mark Rutland <mark.rutland@arm.com> · 2019-02-18
[PATCH 02/13] x86/mm: Add p?d_large() definitions · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 03/13] mm: Add generic p?d_large() macros · Steven Price <steven.price@arm.com> · 2019-02-15
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Mark Rutland <Mark.Rutland@arm.com> · 2019-02-18
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Peter Zijlstra <peterz@infradead.org> · 2019-02-18
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Steven Price <steven.price@arm.com> · 2019-02-18
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Peter Zijlstra <peterz@infradead.org> · 2019-02-18
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Steven Price <steven.price@arm.com> · 2019-02-18
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Liang, Kan <hidden> · 2019-02-19
Re: [PATCH 03/13] mm: Add generic p?d_large() macros · Steven Price <steven.price@arm.com> · 2019-02-20
[PATCH 04/13] mm: pagewalk: Add p4d_entry() and pgd_entry() · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole · Steven Price <steven.price@arm.com> · 2019-02-15
Re: [PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole · Mark Rutland <Mark.Rutland@arm.com> · 2019-02-18
Re: [PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole · Steven Price <steven.price@arm.com> · 2019-02-18
Re: [PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole · William Kucharski <hidden> · 2019-02-20
Re: [PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole · Steven Price <steven.price@arm.com> · 2019-02-20
[PATCH 07/13] mm: pagewalk: Add test_p?d callbacks · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 08/13] arm64: mm: Convert mm/dump.c to use walk_page_range() · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 10/13] x86/mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 11/13] x86/mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 12/13] x86/mm: Convert ptdump_walk_pgd_level_core() to take an mm_struct · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page_range · Steven Price <steven.price@arm.com> · 2019-02-15
Re: [PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page_range · Dave Hansen <hidden> · 2019-02-15
Re: [PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page_range · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 09/13] x86/mm: Point to struct seq_file from struct pg_state · Steven Price <steven.price@arm.com> · 2019-02-15
[PATCH 05/13] mm: pagewalk: Allow walking without vma · Steven Price <steven.price@arm.com> · 2019-02-15

From: William Kucharski <hidden>
Date: 2019-02-20 11:36:03
Also in: linux-mm, lkml

On Feb 15, 2019, at 10:02 AM, Steven Price [off-list ref] wrote:

The pte_hole() callback is called at multiple levels of the page tables.
Code dumping the kernel page tables needs to know what at what depth
the missing entry is. Add this is an extra parameter to pte_hole().
When the depth isn't know (e.g. processing a vma) then -1 is passed.

Note that depth starts at 0 for a PGD so that PUD/PMD/PTE retain their
natural numbers as levels 2/3/4.

Nit: Could you add a comment noting this for anyone wondering how to
calculate the level numbers in the future?

Thanks!

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