linux-kernel - Re: [PATCH 16/22] arm64: Add function to create identity mappings

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Date:	Mon, 17 Feb 2014 08:29:16 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Leif Lindholm <leif.lindholm@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-efi@...r.kernel.org, patches@...aro.org
Subject: Re: [PATCH 16/22] arm64: Add function to create identity mappings

On Fri, 2014-02-14 at 17:42 +0000, Catalin Marinas wrote:
> On Wed, Feb 05, 2014 at 05:04:07PM +0000, Leif Lindholm wrote:
> > +void __init create_id_mapping(phys_addr_t addr, phys_addr_t size, int map_io)
> > +{
> > +	pgd_t *pgd = &idmap_pg_dir[pgd_index(addr)];
> > +
> > +	if (pgd >= &idmap_pg_dir[ARRAY_SIZE(idmap_pg_dir)]) {
> > +		pr_warn("BUG: not creating id mapping for 0x%016llx\n", addr);
> > +		return;
> > +	}
> > +	__create_mapping(pgd, addr, addr, size, map_io);
> > +}
> 
> I'm a bit worried because I gave some feedback in the past but it didn't
> make to this patch.
> 
> What I said on 22nd of January:
> 
>   The condition above is always false since pgd_index() already ands the
>   index with (PTRS_PER_PGD - 1). Better check addr against something like
>   (PTRS_PER_PGD * PGDIR_SIZE) (for clarity, you could do other shifts,
>   doesn't really matter).
> 
Sorry about that. I remember making this change but I don't know what
happened to it.


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