sparc64: Don't clibber fixed registers in __multi4.
%g4 and %g5 are fixed registers used by the kernel for the thread pointer and the per-cpu offset. Use %o4 and %g7 instead. Diagnosis by Anthony Yznaga. Fixes: 1b4af13f ("sparc64: Add __multi3 for gcc 7.x and later.") Reported-by: Anatoly Pugachev <matorola@gmail.com> Tested-by: Anatoly Pugachev <matorola@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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