linux-kernel - Re: [PATCH] Revert "mm/page_isolation: unset migratetype directly for non Buddy page"

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Date:   Mon, 24 Jan 2022 09:41:51 +0100
From:   Francesco Dolcini <francesco.dolcini@...adex.com>
To:     Dong Aisheng <dongas86@...il.com>,
        Chen Wandun <chenwandun@...wei.com>, akpm@...ux-foundation.org,
        guillaume.tucker@...labora.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "mm/page_isolation: unset migratetype directly
 for non Buddy page"

On Tue, Jan 18, 2022 at 09:50:42PM +0800, Dong Aisheng wrote:
> On Mon, Jan 17, 2022 at 10:12 PM Chen Wandun <chenwandun@...wei.com> wrote:
> >
> > This reverts commit 075782149abff45ee22f27315eced44d02b96779.
> >
> > commit 075782149abf ("mm/page_isolation: unset migratetype directly for
> > non Buddy page") will result memory that should in buddy disappear by
> > mistake. move_freepages_block move all pages in pageblock instead of
> > pages indicated by input parameter, so if input pages is not in buddy
> > but other pages in pageblock is in buddy, it will result in page out of
> > control.
> >
> > Reported-by: "kernelci.org bot" <bot@...nelci.org>
> > Signed-off-by: Chen Wandun <chenwandun@...wei.com>
> 
> The original patch broke imx6ul evk booting up.
> Tested-by: Dong Aisheng <aisheng.dong@....com>

Same issue present on imx7.
Tested-by: Francesco Dolcini <francesco.dolcini@...adex.com>