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get_tbl() is confusing as it returns the content TBL register on PPC32 but the concatenation of TBL and TBU on PPC64. Use mftb() instead. This will allow the removal of get_tbl() in a following patch. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/decefb47c8a2070bf55d20b096b813908c7b3110.1612866360.git.christophe.leroy@csgroup.eu