linux-kernel - Re: [PATCH 14/17] mm: Make hibernate handle unmapped pages

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Date:   Fri, 18 Jan 2019 09:16:09 +0100
From:   Pavel Machek <pavel@....cz>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "Dock, Deneen T" <deneen.t.dock@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "nadav.amit@...il.com" <nadav.amit@...il.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
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        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>
Subject: Re: [PATCH 14/17] mm: Make hibernate handle unmapped pages

On Thu 2019-01-17 23:48:30, Edgecombe, Rick P wrote:
> On Fri, 2019-01-18 at 00:41 +0100, Pavel Machek wrote:
> > Hi!
> > 
> > > > > For architectures with CONFIG_ARCH_HAS_SET_ALIAS, pages can be unmapped
> > > > > briefly on the directmap, even when CONFIG_DEBUG_PAGEALLOC is not
> > > > > configured.
> > > > > So this changes kernel_map_pages and kernel_page_present to be defined
> > > > > when
> > > > > CONFIG_ARCH_HAS_SET_ALIAS is defined as well. It also changes places
> > > > > (page_alloc.c) where those functions are assumed to only be implemented
> > > > > when
> > > > > CONFIG_DEBUG_PAGEALLOC is defined.
> > > > 
> > > > Which architectures are that?
> > > > 
> > > > Should this be merged to the patch where HAS_SET_ALIAS is introduced? We
> > > > don't want broken hibernation in between....
> > > 
> > > Thanks for taking a look. It was added for x86 for patch 13 in this patchset
> > > and
> > > there was interest expressed for adding for arm64. If you didn't get the
> > > whole
> > > set and want to see let me know and I can send it.
> > 
> > I googled in in the meantime.
> > 
> > Anyway, if something is broken between patch 13 and 14, then they
> > should be same patch.
> Great. It should be ok because the new functions are not used anywhere until
> after this patch.

Ok, that makes sense.

Acked-by: Pavel Machek <pavel@....cz>
									Pavel

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