On Wed, Nov 18 2015 at 09:46:38 PM, Michael Ellerman <m...@ellerman.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@1ffe600000 (0x0000001ffe600000--0x0000001ffe700000) overlaps
> with
> ibm,firmware-allocs-memory@1000000000
> (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 <m...@ellerman.id.au>
> ---
> drivers/of/of_reserved_mem.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
Woops, thanks.
Tested-by: Mitchel Humpherys <mitch...@codeaurora.org>
-Mitch
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
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