Re: [PATCH] powerpc/fadump: Fix build error with CONFIG_PRESERVE_FA_DUMP=y

skiroot_defconfig fails:

arch/powerpc/kernel/fadump.c:48:17: error: ‘cpus_in_fadump’ defined but not used
    48 | static atomic_t cpus_in_fadump;

Fix it by moving the definition into the #ifdef where it's used.

Fixes: ba608c4fa12c ("powerpc/fadump: fix race between pstore write and fadump crash trigger")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
  arch/powerpc/kernel/fadump.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 1858896d6809..10ebb4bf71ad 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c

@@ -45,10 +45,12 @@ static struct fw_dump fw_dump;
  static void __init fadump_reserve_crash_area(u64 base);

  struct kobject *fadump_kobj;
-static atomic_t cpus_in_fadump;

  #ifndef CONFIG_PRESERVE_FA_DUMP
+
+static atomic_t cpus_in_fadump;
  static DEFINE_MUTEX(fadump_mutex);
+
  struct fadump_mrange_info crash_mrange_info = { "crash", NULL, 0, 0, 0, false };

  #define RESERVED_RNGS_SZ	16384 /* 16K - 128 entries */