Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 30 Dec 2020 12:42:33 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     Hui Su <sh_def@163.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH] mm/page_alloc: remove the static for local variable
 node_order
Message-ID: <20201230124233.GE28221@casper.infradead.org>
References: <20201230114014.GA1934427@ubuntu-A520I-AC>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20201230114014.GA1934427@ubuntu-A520I-AC>
Precedence: bulk

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.

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.