linux-kernel - Re: [PATCHv8 02/14] mm: Add support for unaccepted memory

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Message-ID: <Y6mSNhO3vpuzjr8O@zn.tnic>
Date:   Mon, 26 Dec 2022 13:23:18 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dario Faggioli <dfaggioli@...e.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        aarcange@...hat.com, peterx@...hat.com, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCHv8 02/14] mm: Add support for unaccepted memory

On Wed, Dec 07, 2022 at 04:49:21AM +0300, Kirill A. Shutemov wrote:
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 6e60657875d3..6d597e833a73 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -450,6 +450,11 @@ EXPORT_SYMBOL(nr_online_nodes);
>  
>  int page_group_by_mobility_disabled __read_mostly;
>  
> +#ifdef CONFIG_UNACCEPTED_MEMORY
> +/* Counts number of zones with unaccepted pages. */
> +static DEFINE_STATIC_KEY_FALSE(unaccepted_pages);

Then call it what it is:

static DEFINE_STATIC_KEY_FALSE(zones_with_unaccepted_pages);

so that when reading the code it is self-describing:

        if (!static_branch_unlikely(&zones_with_unaccepted_pages))
                return false;

-- 
Regards/Gruss,
    Boris.

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