powerpc: Remove duplicate/unnecessary ifdefs

When an ifdef is used in the below manner, second one could be considered
as duplicate.

  ifdef DEFINE_A
  ...code block...
  ifdef DEFINE_A       <-- This is a duplicate.
  ...code block...
  endif
  else
  ifndef DEFINE_A     <-- This is also duplicate.
  ...code block...
  endif
  endif

More details about the script and methods used to find these code
patterns are in cover letter of [1].

Few places in arch/powerpc where this pattern was seen:

  paca.h:
  Hunk1: Code is under check of CONFIG_PPC64 from line 13, hence the
  second CONFIG_PPC64 at line 166 is a duplicate.
  Hunk2: CONFIG_PPC_BOOK3S_64 was defined back to back. Merged the two
  ifdefs.

  asm-offsets.c:
  Code is under check of CONFIG_PPC64 from line 176 hence second
  CONFIG_PPC64 at line 249 is a duplicate.

  powermac/feature.c:
  #ifndef CONFIG_PPC64 is used at line 2066. And then in #else again
  #ifdef CONFIG_PPC64 is used. Which is a duplicate since in #else means
  CONFIG_PPC64 is defined.

  xmon.c:
  Code is under the check of CONFIG_SMP from line 521 hence the same
  check of CONFIG_SMP at line 646 is a duplicate.

No functional change is intended here. It only aims to improve code
readability.

[1] https://lore.kernel.org/all/20240118080326.13137-1-sshegde@linux.ibm.com/Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240216053016.528906-1-sshegde@linux.ibm.com

arch/powerpc/include/asm/paca.h

@@ -163,9 +163,7 @@ struct paca_struct {
 	u64 kstack;			/* Saved Kernel stack addr */
 	u64 saved_r1;			/* r1 save for RTAS calls or PM or EE=0 */
 	u64 saved_msr;			/* MSR saved here by enter_rtas */
-#ifdef CONFIG_PPC64
 	u64 exit_save_r1;		/* Syscall/interrupt R1 save */
-#endif
 #ifdef CONFIG_PPC_BOOK3E_64
 	u16 trap_save;			/* Used when bad stack is encountered */
 #endif
@@ -214,8 +212,6 @@ struct paca_struct {
 	/* Non-maskable exceptions that are not performance critical */
 	u64 exnmi[EX_SIZE];	/* used for system reset (nmi) */
 	u64 exmc[EX_SIZE];	/* used for machine checks */
-#endif
-#ifdef CONFIG_PPC_BOOK3S_64
 	/* Exclusive stacks for system reset and machine check exception. */
 	void *nmi_emergency_sp;
 	void *mc_emergency_sp;

arch/powerpc/kernel/asm-offsets.c

@@ -246,9 +246,7 @@ int main(void)
 	OFFSET(PACAHWCPUID, paca_struct, hw_cpu_id);
 	OFFSET(PACAKEXECSTATE, paca_struct, kexec_state);
 	OFFSET(PACA_DSCR_DEFAULT, paca_struct, dscr_default);
-#ifdef CONFIG_PPC64
 	OFFSET(PACA_EXIT_SAVE_R1, paca_struct, exit_save_r1);
-#endif
 #ifdef CONFIG_PPC_BOOK3E_64
 	OFFSET(PACA_TRAP_SAVE, paca_struct, trap_save);
 #endif

arch/powerpc/platforms/powermac/feature.c

@@ -2333,7 +2333,6 @@ static struct pmac_mb_def pmac_mb_defs[] = {
 		PMAC_TYPE_POWERMAC_G5,		g5_features,
 		0,
 	},
-#ifdef CONFIG_PPC64
 	{	"PowerMac7,3",			"PowerMac G5",
 		PMAC_TYPE_POWERMAC_G5,		g5_features,
 		0,
@@ -2359,7 +2358,6 @@ static struct pmac_mb_def pmac_mb_defs[] = {
 		0,
 	},
 #endif /* CONFIG_PPC64 */
-#endif /* CONFIG_PPC64 */
 };
 
 /*

arch/powerpc/xmon/xmon.c

@@ -643,10 +643,8 @@ static int xmon_core(struct pt_regs *regs, volatile int fromipi)
 			touch_nmi_watchdog();
 		} else {
 			cmd = 1;
-#ifdef CONFIG_SMP
 			if (xmon_batch)
 				cmd = batch_cmds(regs);
-#endif
 			if (!locked_down && cmd)
 				cmd = cmds(regs);
 			if (locked_down || cmd != 0) {