[NET]: Make illegal_highdma more anal
Rather than having illegal_highdma as a macro when HIGHMEM is off, we can turn it into an inline function that returns zero. This will catch callers that give it bad arguments. Signed-off-by:Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
David S. Miller <davem@davemloft.net>
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