[PATCH] powerpc/mm: Move the linear_mapping_mutex to the ifdef where it is used

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

The mutex linear_mapping_mutex is defined at the of the file while its
only two user are within the CONFIG_MEMORY_HOTPLUG block.
A compile without CONFIG_MEMORY_HOTPLUG set fails on PREEMPT_RT because
its mutex implementation is smart enough to realize that it is unused.

Move the definition of linear_mapping_mutex to ifdef block where it is
used.

Fixes: 1f73ad3e8d755 ("powerpc/mm: print warning in arch_remove_linear_mapping()")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 arch/powerpc/mm/mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index afab328d08874..d6c3f0b79f1d1 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -54,7 +54,6 @@
 
 #include <mm/mmu_decl.h>
 
-static DEFINE_MUTEX(linear_mapping_mutex);
 unsigned long long memory_limit;
 bool init_mem_is_free;
 
@@ -72,6 +71,7 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 EXPORT_SYMBOL(phys_mem_access_prot);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
+static DEFINE_MUTEX(linear_mapping_mutex);
 
 #ifdef CONFIG_NUMA
 int memory_add_physaddr_to_nid(u64 start)
-- 
2.30.0