x86/pmc_atom: Silence shift wrapping warnings in pmc_sleep_tmr_show()

I don't know if we really need 64 bits here but these variables are
declared as u64 and it can't hurt to cast this so we prevent any shift
wrapping.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Aubrey Li <aubrey.li@linux.intel.com>
Link: http://lkml.kernel.org/r/20140801082715.GE28869@mwandaSigned-off-by: H. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/pmc_atom.c

@@ -174,11 +174,11 @@ static int pmc_sleep_tmr_show(struct seq_file *s, void *unused)
 	struct pmc_dev *pmc = s->private;
 	u64 s0ir_tmr, s0i1_tmr, s0i2_tmr, s0i3_tmr, s0_tmr;
 
-	s0ir_tmr = pmc_reg_read(pmc, PMC_S0IR_TMR) << PMC_TMR_SHIFT;
-	s0i1_tmr = pmc_reg_read(pmc, PMC_S0I1_TMR) << PMC_TMR_SHIFT;
-	s0i2_tmr = pmc_reg_read(pmc, PMC_S0I2_TMR) << PMC_TMR_SHIFT;
-	s0i3_tmr = pmc_reg_read(pmc, PMC_S0I3_TMR) << PMC_TMR_SHIFT;
-	s0_tmr = pmc_reg_read(pmc, PMC_S0_TMR) << PMC_TMR_SHIFT;
+	s0ir_tmr = (u64)pmc_reg_read(pmc, PMC_S0IR_TMR) << PMC_TMR_SHIFT;
+	s0i1_tmr = (u64)pmc_reg_read(pmc, PMC_S0I1_TMR) << PMC_TMR_SHIFT;
+	s0i2_tmr = (u64)pmc_reg_read(pmc, PMC_S0I2_TMR) << PMC_TMR_SHIFT;
+	s0i3_tmr = (u64)pmc_reg_read(pmc, PMC_S0I3_TMR) << PMC_TMR_SHIFT;
+	s0_tmr = (u64)pmc_reg_read(pmc, PMC_S0_TMR) << PMC_TMR_SHIFT;
 
 	seq_printf(s, "S0IR Residency:\t%lldus\n", s0ir_tmr);
 	seq_printf(s, "S0I1 Residency:\t%lldus\n", s0i1_tmr);