linux-kernel - Re: [PATCH] of: Fix comparison of reserved memory regions

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Date:	Fri, 04 Dec 2015 09:07:39 -0800
From:	Mitchel Humpherys <mitchelh@...eaurora.org>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	robh+dt@...nel.org, devicetree@...r.kernel.org,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...abs.org>,
	frowand.list@...il.com, grant.likely@...aro.org
Subject: Re: [PATCH] of: Fix comparison of reserved memory regions

On Wed, Nov 18 2015 at 09:46:38 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> In order to check for overlapping reserved memory regions, we first need
> to sort the array of memory regions. This is implemented using sort(),
> and a custom comparison function __rmem_cmp().
>
> Unfortunatley __rmem_cmp() doesn't work in all cases. Because the two
> base values are phys_addr_t, they may be u64 on some platforms, in which
> case subtracting one from the other and then (implicitly) casting to int
> does not give us the -ve/0/+ve value we need.
>
> This leads to incorrect reports about overlaps, eg:
>
>   ibm,slw-image@...e600000 (0x0000001ffe600000--0x0000001ffe700000) overlaps with
>   ibm,firmware-allocs-memory@...0000000 (0x0000001000000000--0x0000001000dc0200)
>
> Fix it by just doing the standard double if and return 0 logic.
>
> Fixes: ae1add247bf8 ("of: Check for overlap in reserved memory regions")
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>  drivers/of/of_reserved_mem.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)

Woops, thanks.

Tested-by: Mitchel Humpherys <mitchelh@...eaurora.org>

-Mitch

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