linux-kernel - Re: [PATCH] x86/vmemmap: Handle unpopulated sub-pmd ranges

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Message-ID: <20210127113436.GA28551@linux>
Date:   Wed, 27 Jan 2021 12:34:41 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/vmemmap: Handle unpopulated sub-pmd ranges

On Wed, Jan 27, 2021 at 12:29:27PM +0100, David Hildenbrand wrote:
> > diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> > index b5a3fa4033d3..9b6d45ea353b 100644
> > --- a/arch/x86/mm/init_64.c
> > +++ b/arch/x86/mm/init_64.c
> > @@ -873,6 +873,71 @@ int arch_add_memory(int nid, u64 start, u64 size,
> >   #define PAGE_INUSE 0xFD
> 
> Note that I called it "PAGE_UNUSED", using "PAGE_INUSE" might make it a
> little harder to digest.

Yeah, I wanted to recycle the PAGE_INUSE macro for x86, but on a second though
we might just call it PAGE_UNUSE as it gives a better perspective.

Let us see if there are other pushbacks/reviews, and if not, I shall re-submit
with that addressed.

Thanks

-- 
Oscar Salvador
SUSE L3