From: "Raslan, KarimAllah" <karahmed@amazon•de>
To: "will@kernel•org" <will@kernel•org>
Cc: "mark.rutland@arm•com" <mark.rutland@arm•com>,
"anders.roxell@linaro•org" <anders.roxell@linaro•org>,
"yuzhao@google•com" <yuzhao@google•com>,
"ard.biesheuvel@linaro•org" <ard.biesheuvel@linaro•org>,
"info@metux•net" <info@metux•net>,
"anshuman.khandual@arm•com" <anshuman.khandual@arm•com>,
"linux@armlinux•org.uk" <linux@armlinux•org.uk>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
"yaojun8558363@gmail•com" <yaojun8558363@gmail•com>,
"james.morse@arm•com" <james.morse@arm•com>,
"catalin.marinas@arm•com" <catalin.marinas@arm•com>,
"tglx@linutronix•de" <tglx@linutronix•de>,
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"akpm@linux-foundation•org" <akpm@linux-foundation•org>,
"linux-arm-kernel@lists•infradead.org"
<linux-arm-kernel@lists•infradead.org>
Subject: Re: [PATCH] arm: Extend the check for RAM in /dev/mem
Date: Fri, 12 Jul 2019 15:13:38 +0000 [thread overview]
Message-ID: <1562944417.1345.17.camel@amazon.de> (raw)
In-Reply-To: <20190712145711.mxmnuyn6kpv2dr7u@willie-the-truck>
On Fri, 2019-07-12 at 15:57 +0100, Will Deacon wrote:
> On Fri, Jul 12, 2019 at 12:21:21AM +0200, KarimAllah Ahmed wrote:
> >
> > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> > index 3645f29..cdc3e8e 100644
> > --- a/arch/arm64/mm/mmu.c
> > +++ b/arch/arm64/mm/mmu.c
> > @@ -78,7 +78,7 @@ void set_swapper_pgd(pgd_t *pgdp, pgd_t pgd)
> > pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
> > unsigned long size, pgprot_t vma_prot)
> > {
> > - if (!pfn_valid(pfn))
> > + if (!memblock_is_memory(__pfn_to_phys(pfn)))
>
> This looks broken to me, since it will end up returning 'true' for nomap
> memory and we really don't want to map that using writeback attributes.
True, I will fix this by using memblock_is_map_memory instead. That said, do
you have any concerns about this approach in general?
>
> Will
Amazon Development Center Germany GmbH
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10117 Berlin
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next prev parent reply other threads:[~2019-07-12 15:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-11 22:21 [PATCH] arm: Extend the check for RAM in /dev/mem KarimAllah Ahmed
2019-07-12 2:36 ` Anshuman Khandual
2019-07-12 2:58 ` Raslan, KarimAllah
2019-07-12 8:56 ` Russell King - ARM Linux admin
2019-07-12 8:59 ` Raslan, KarimAllah
2019-07-12 14:57 ` Will Deacon
2019-07-12 15:13 ` Raslan, KarimAllah [this message]
2019-07-12 15:34 ` Will Deacon
2019-07-12 15:46 ` Raslan, KarimAllah
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