linux-kernel - Re: [PATCH v8 1/1] mm/page_alloc.c: refactor initialization of struct page for holes in memory layout

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Message-ID: <20210226061447.GN1447004@kernel.org>
Date:   Fri, 26 Feb 2021 08:14:47 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Baoquan He <bhe@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        David Hildenbrand <david@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Łukasz Majczak <lma@...ihalf.com>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, Qian Cai <cai@....pw>,
        "Sarvela, Tomi P" <tomi.p.sarvela@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, stable@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v8 1/1] mm/page_alloc.c: refactor initialization of
 struct page for holes in memory layout

On Thu, Feb 25, 2021 at 04:08:51PM -0800, Andrew Morton wrote:
> On Fri, 26 Feb 2021 00:43:51 +0200 Mike Rapoport <rppt@...nel.org> wrote:
> 
> > From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> >  void __meminit __weak memmap_init_zone(struct zone *zone)
> >  {
> >  	unsigned long zone_start_pfn = zone->zone_start_pfn;
> >  	unsigned long zone_end_pfn = zone_start_pfn + zone->spanned_pages;
> >  	int i, nid = zone_to_nid(zone), zone_id = zone_idx(zone);
> > +	static unsigned long hole_pfn = 0;
> 
> static implies that pgdat->node_zones[] is alwyas sorted in ascending
> pfn order.  Always true?

Yes.

-- 
Sincerely yours,
Mike.