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

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Date:   Wed, 17 Nov 2021 11:43:55 -0500
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Paul Turner <pjt@...gle.com>, weixugc@...gle.com,
        Greg Thelen <gthelen@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>, masahiroy@...nel.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        frederic@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [RFC 1/3] mm: ptep_clear() page table helper

On Wed, Nov 17, 2021 at 3:52 AM Anshuman Khandual
<anshuman.khandual@....com> wrote:
>
>
>
> 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 ?

You are right, I need to replace it in mm/debug_vm_pgtable.c as well.
I will do it in the next version.

Thanks,
Pasha