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

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Message-ID: <20191205221452.GB25107@duo.ucw.cz>
Date:   Thu, 5 Dec 2019 23:14:52 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.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>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 226/321] mm/hotplug: invalid PFNs from
 pfn_to_online_page()

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?

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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