linux-kernel - Re: [PATCH] mm/page_alloc: remove the static for local variable node

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Date:   Mon, 4 Jan 2021 15:23:57 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Hui Su <sh_def@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm/page_alloc: remove the static for local variable
 node_order

On Wed, 30 Dec 2020 12:42:33 +0000 Matthew Wilcox <willy@...radead.org> wrote:

> On Wed, Dec 30, 2020 at 07:40:14PM +0800, Hui Su wrote:
> > local variable node_order do not need the static here.
> 
> It bloody well does.  It can be up to 2^10 entries on x86 (and larger
> on others) That's 4kB which you've now moved onto the stack.

That being said, could we kmalloc the scratch area in
__build_all_zonelists()?  And maybe remove that static spinlock?

(what blocks node and cpu hotplug in there??)