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

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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: 1f73ad3e8d ("powerpc/mm: print warning in arch_remove_linear_mapping()")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210219165648.2505482-1-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2021-02-19 17:56:48 +01:00 committed by Michael Ellerman
parent 1e28eed176
commit 9be77e11da
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/mm/mem.c
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@ -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)