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[ Upstream commitc42d3be0c0] The problem is the the calculation should be "end - start + 1" but the plus one is missing in this calculation. Fixes:8626816e90("powerpc: add support for MPIC message register API") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>