MIPS: Export mm switching functions used by KVM

KVM makes use of check_switch_mmu_context(), check_mmu_context() &
get_new_mmu_context() which are no longer static inline functions in a
header. As such they need to be exported for KVM to successfully build
as a module, which was previously overlooked. Add the missing exports.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: 4ebea49c ("MIPS: mm: Un-inline get_new_mmu_context")
Fixes: 42d5b846 ("MIPS: mm: Unify ASID version checks")

arch/mips/mm/context.c

@@ -42,6 +42,7 @@ void get_new_mmu_context(struct mm_struct *mm)
 	set_cpu_context(cpu, mm, asid);
 	asid_cache(cpu) = asid;
 }
+EXPORT_SYMBOL_GPL(get_new_mmu_context);
 
 void check_mmu_context(struct mm_struct *mm)
 {
@@ -58,6 +59,7 @@ void check_mmu_context(struct mm_struct *mm)
 	if (!asid_versions_eq(cpu, cpu_context(cpu, mm), asid_cache(cpu)))
 		get_new_mmu_context(mm);
 }
+EXPORT_SYMBOL_GPL(check_mmu_context);
 
 static void flush_context(void)
 {
@@ -260,6 +262,7 @@ void check_switch_mmu_context(struct mm_struct *mm)
 setup_pgd:
 	TLBMISS_HANDLER_SETUP_PGD(mm->pgd);
 }
+EXPORT_SYMBOL_GPL(check_switch_mmu_context);
 
 static int mmid_init(void)
 {