linux-kernel - Re: [PATCH] mm/page_alloc: fix a crash in free_pages

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Message-ID: <20190930110434.5k47w7xfvkjcohkp@box>
Date:   Mon, 30 Sep 2019 14:04:34 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Qian Cai <cai@....pw>
Cc:     akpm@...ux-foundation.org, heiko.carstens@...ibm.com,
        gor@...ux.ibm.com, borntraeger@...ibm.com,
        linux-s390@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/page_alloc: fix a crash in free_pages_prepare()

On Fri, Sep 27, 2019 at 03:47:03PM -0400, Qian Cai wrote:
> On architectures like s390, arch_free_page() could mark the page unused
> (set_page_unused()) and any access later would trigger a kernel panic.
> Fix it by moving arch_free_page() after all possible accessing calls.

Looks like Power also uses the hook. Have you check that this patch will
not affect Power?

-- 
 Kirill A. Shutemov