linux-kernel - Re: [PATCH 4.19 226/321] mm/hotplug: invalid PFNs from pfn_to_online

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Message-ID: <20191206130505.GD1399220@kroah.com>
Date:   Fri, 6 Dec 2019 14:05:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>, Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Qian Cai <cai@....pw>, Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.19 226/321] mm/hotplug: invalid PFNs from
 pfn_to_online_page()

On Thu, Dec 05, 2019 at 11:14:52PM +0100, Pavel Machek wrote:
> Hi!
> 
> > This is due to the commit 9f1eb38e0e11 ("mm, kmemleak: little
> > optimization while scanning") starts to use pfn_to_online_page() instead
> > of pfn_valid().  However, in the CONFIG_MEMORY_HOTPLUG=y case,
> > pfn_to_online_page() does not call memblock_is_map_memory() while
> > pfn_valid() does.
> ...
> > Fixes: 9f1eb38e0e11 ("mm, kmemleak: little optimization while scanning")
> 
> Commit 9f1eb38e0e11 does not seem to be in v4.19-stable tree. Is this
> commit still neccessary/good idea?

Good catch.

Sasha, should this be reverted?  How did your scripts pick this?

thanks,

greg k-h