powerpc/iommu: Use bitmap library
- Caluculate the bitmap size with BITS_TO_LONGS()
- Use bitmap_empty() to verify that all bits are cleared
This also includes a printk to pr_warn() conversion.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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