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

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Message-ID: <20201230125944.GA2040977@ubuntu-A520I-AC>
Date:   Wed, 30 Dec 2020 20:59:44 +0800
From:   Hui Su <sh_def@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, 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

Hi, Matthew:

On Wed, Dec 30, 2020 at 12:42:33PM +0000, Matthew Wilcox 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.
> 
Thanks for your explanation, this change will put too much onto the stack
in some cases which i didn't consider.

Please ignore this change.

> Please, learn more about what you're doing.  I suggest sending patches
> to drivers/staging; that will help you learn how to submit patches to
> linux.