linux-kernel - Re: [RFC 1/3] mm: ptep_clear() page table helper

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Message-ID: <e461ba08-0aa8-e405-6383-5d921443135a@arm.com>
Date:   Wed, 17 Nov 2021 14:21:47 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Pasha Tatashin <pasha.tatashin@...een.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, akpm@...ux-foundation.org,
        rientjes@...gle.com, pjt@...gle.com, weixugc@...gle.com,
        gthelen@...gle.com, mingo@...hat.com, corbet@....net,
        will@...nel.org, rppt@...nel.org, keescook@...omium.org,
        tglx@...utronix.de, peterz@...radead.org, masahiroy@...nel.org,
        samitolvanen@...gle.com, dave.hansen@...ux.intel.com,
        x86@...nel.org, frederic@...nel.org, hpa@...or.com,
        aneesh.kumar@...ux.ibm.com
Subject: Re: [RFC 1/3] mm: ptep_clear() page table helper



On 11/17/21 3:30 AM, Pasha Tatashin wrote:
> diff --git a/Documentation/vm/arch_pgtable_helpers.rst b/Documentation/vm/arch_pgtable_helpers.rst
> index 552567d863b8..fbe06ec75370 100644
> --- a/Documentation/vm/arch_pgtable_helpers.rst
> +++ b/Documentation/vm/arch_pgtable_helpers.rst
> @@ -66,9 +66,11 @@ PTE Page Table Helpers
>  +---------------------------+--------------------------------------------------+
>  | pte_mknotpresent          | Invalidates a mapped PTE                         |
>  +---------------------------+--------------------------------------------------+
> -| ptep_get_and_clear        | Clears a PTE                                     |
> +| ptep_clear                | Clears a PTE                                     |
>  +---------------------------+--------------------------------------------------+
> -| ptep_get_and_clear_full   | Clears a PTE                                     |
> +| ptep_get_and_clear        | Clears and returns PTE                           |
> ++---------------------------+--------------------------------------------------+
> +| ptep_get_and_clear_full   | Clears and returns PTE (batched PTE unmap)       |
>  +---------------------------+--------------------------------------------------+
>  | ptep_test_and_clear_young | Clears young from a PTE                          |
>  +---------------------------+--------------------------------------------------+

Just curious. This does not have a corresponding change in mm/debug_vm_pgtable.c ?