[PATCH] Xen: drop exports of {set,clear}_foreign_p2m_mapping()

[Jan Beulich <jbeulich@xxxxxxxx>]

They're only used internally, and the layering violation they contain
(x86) or imply (Arm) of calling HYPERVISOR_grant_table_op() strongly
advise against any (uncontrolled) use from a module. The functions also
never had users except the ones from drivers/xen/grant-table.c forever
since their introduction in 3.15.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
It's not clear to me why Arm doesn't have merely stubs just like x86 has
when PV support is disabled.

--- a/arch/arm/xen/p2m.c
+++ b/arch/arm/xen/p2m.c
@@ -130,7 +130,6 @@ int set_foreign_p2m_mapping(struct gntta
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
 
 int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
                              struct gnttab_unmap_grant_ref *kunmap_ops,
@@ -145,7 +144,6 @@ int clear_foreign_p2m_mapping(struct gnt
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
 
 bool __set_phys_to_machine_multi(unsigned long pfn,
                unsigned long mfn, unsigned long nr_pages)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -776,7 +776,6 @@ int set_foreign_p2m_mapping(struct gntta
 out:
        return ret;
 }
-EXPORT_SYMBOL_GPL(set_foreign_p2m_mapping);
 
 int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
                              struct gnttab_unmap_grant_ref *kunmap_ops,
@@ -802,7 +801,6 @@ int clear_foreign_p2m_mapping(struct gnt
 
        return ret;
 }
-EXPORT_SYMBOL_GPL(clear_foreign_p2m_mapping);
 
 #ifdef CONFIG_XEN_DEBUG_FS
 #include <linux/debugfs.h>