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-rw-r--r--arch/arm/kernel/suspend.c64
1 files changed, 36 insertions, 28 deletions
diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
index c59c97ea826..38a50676213 100644
--- a/arch/arm/kernel/suspend.c
+++ b/arch/arm/kernel/suspend.c
@@ -10,6 +10,42 @@
extern int __cpu_suspend(unsigned long, int (*)(unsigned long));
extern void cpu_resume_mmu(void);
+#ifdef CONFIG_MMU
+/*
+ * Hide the first two arguments to __cpu_suspend - these are an implementation
+ * detail which platform code shouldn't have to know about.
+ */
+int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
+{
+ struct mm_struct *mm = current->active_mm;
+ int ret;
+
+ if (!idmap_pgd)
+ return -EINVAL;
+
+ /*
+ * Provide a temporary page table with an identity mapping for
+ * the MMU-enable code, required for resuming. On successful
+ * resume (indicated by a zero return code), we need to switch
+ * back to the correct page tables.
+ */
+ ret = __cpu_suspend(arg, fn);
+ if (ret == 0) {
+ cpu_switch_mm(mm->pgd, mm);
+ local_flush_bp_all();
+ local_flush_tlb_all();
+ }
+
+ return ret;
+}
+#else
+int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
+{
+ return __cpu_suspend(arg, fn);
+}
+#define idmap_pgd NULL
+#endif
+
/*
* This is called by __cpu_suspend() to save the state, and do whatever
* flushing is required to ensure that when the CPU goes to sleep we have
@@ -46,31 +82,3 @@ void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
outer_clean_range(virt_to_phys(save_ptr),
virt_to_phys(save_ptr) + sizeof(*save_ptr));
}
-
-/*
- * Hide the first two arguments to __cpu_suspend - these are an implementation
- * detail which platform code shouldn't have to know about.
- */
-int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
-{
- struct mm_struct *mm = current->active_mm;
- int ret;
-
- if (!idmap_pgd)
- return -EINVAL;
-
- /*
- * Provide a temporary page table with an identity mapping for
- * the MMU-enable code, required for resuming. On successful
- * resume (indicated by a zero return code), we need to switch
- * back to the correct page tables.
- */
- ret = __cpu_suspend(arg, fn);
- if (ret == 0) {
- cpu_switch_mm(mm->pgd, mm);
- local_flush_bp_all();
- local_flush_tlb_all();
- }
-
- return ret;
-}