powerpc/64s/exception: machine check remove machine_check_pSeries_0 branch

This label has only one caller, so unwind the branch and move it
inline. The location of the comment is adjusted to match similar
one in system reset.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-7-npiggin@gmail.com

arch/powerpc/kernel/exceptions-64s.S

@@ -1014,20 +1014,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
 	b	1b
 	b	.	/* prevent speculative execution */
 
-TRAMP_REAL_BEGIN(machine_check_pSeries)
-	.globl machine_check_fwnmi
-machine_check_fwnmi:
+#ifdef CONFIG_PPC_PSERIES
+TRAMP_REAL_BEGIN(machine_check_fwnmi)
 	EXCEPTION_PROLOG_0 PACA_EXMC
 	b	machine_check_common_early
-
-machine_check_pSeries_0:
-	EXCEPTION_PROLOG_1 EXC_STD, PACA_EXMC, 1, 0x200, 1, 1, 0
-	/*
-	 * MSR_RI is not enabled, because PACA_EXMC is being used, so a
-	 * nested machine check corrupts it. machine_check_common enables
-	 * MSR_RI.
-	 */
-	EXCEPTION_PROLOG_2_REAL machine_check_common, EXC_STD, 0
+#endif
 
 TRAMP_KVM_SKIP(PACA_EXMC, 0x200)
 
@@ -1197,7 +1188,13 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
 	/* Deliver the machine check to host kernel in V mode. */
 	MACHINE_CHECK_HANDLER_WINDUP
 	EXCEPTION_PROLOG_0 PACA_EXMC
-	b	machine_check_pSeries_0
+	EXCEPTION_PROLOG_1 EXC_STD, PACA_EXMC, 1, 0x200, 1, 1, 0
+	EXCEPTION_PROLOG_2_REAL machine_check_common, EXC_STD, 0
+	/*
+	 * MSR_RI is not enabled, because PACA_EXMC is being used, so a
+	 * nested machine check corrupts it. machine_check_common enables
+	 * MSR_RI.
+	 */
 
 EXC_COMMON_BEGIN(unrecover_mce)
 	/* Invoke machine_check_exception to print MCE event and panic. */