From: Michal Hocko <mhocko@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Daniel Vacek <neelx@redhat.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Mel Gorman <mgorman@techsingularity.net>,
Paul Burton <paul.burton@imgtec.com>,
Pavel Tatashin <pasha.tatashin@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v2] Revert "mm/page_alloc: fix memmap_init_zone pageblock alignment"
Date: Thu, 15 Mar 2018 19:35:06 +0100 [thread overview]
Message-ID: <20180315183506.GT23100@dhcp22.suse.cz> (raw)
In-Reply-To: <CA+55aFy0+EP14zjnYh1x_Aw3y-wCp2COpw9D-OfmhA9YFfsQiA@mail.gmail.com>
On Thu 15-03-18 11:28:27, Linus Torvalds wrote:
> On Thu, Mar 15, 2018 at 11:21 AM, Michal Hocko <mhocko@kernel.org> wrote:
> >
> > Well, pfn_valid says that a given pfn is backed by a real memory and it
> > has a valid struct page backing it.
>
> No, it really just says the latter. There should be a "struct page" for it.
You are right! A simple example could be non volatile memory. That is
certainly not RAM but it has pfn_valid memory. Sorry about the
confusion.
--
Michal Hocko
SUSE Labs
prev parent reply other threads:[~2018-03-15 18:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 19:29 Ard Biesheuvel
2018-03-14 22:25 ` Jan Glauber
2018-03-14 22:53 ` Shanker Donthineni
2018-03-18 12:02 ` Neil Armstrong
2018-03-14 23:34 ` Linus Torvalds
2018-03-15 2:23 ` Daniel Vacek
2018-03-15 7:36 ` Ard Biesheuvel
2018-03-15 7:44 ` Daniel Vacek
2018-03-15 7:45 ` Ard Biesheuvel
2018-03-15 15:12 ` Daniel Vacek
2018-03-15 15:17 ` Ard Biesheuvel
2018-03-15 15:34 ` Daniel Vacek
2018-03-15 15:48 ` Ard Biesheuvel
2018-03-15 18:21 ` Michal Hocko
2018-03-15 18:28 ` Linus Torvalds
2018-03-15 18:35 ` Michal Hocko [this message]
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