set_direct_map_*() implementations verify wheter the direct map can be
effectively set. This verification can be costly. Add an "advanced" API
__set_direct_map_*() where the direct map is modified without any check.
The caller must have verified it is safe earlier with one of the
can_set_direct_map() or can_set_direct_map_range() functions.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>

diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index 88175c3fa751..5a1917a3fd52 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -34,6 +34,15 @@ static inline int set_direct_map_default_noflush(struct page *page)
 	return 0;
 }
 
+static inline int __set_direct_map_invalid_noflush(struct page *page)
+{
+	return 0;
+}
+static inline int __set_direct_map_default_noflush(struct page *page)
+{
+	return 0;
+}
+
 static inline int set_direct_map_valid_noflush(struct page *page,
 					       unsigned nr, bool valid)
 {
@@ -70,6 +79,22 @@ static inline bool can_set_direct_map_range(struct page *page, unsigned long nr_
 }
 #define can_set_direct_map_range can_set_direct_map_range
 #endif
+
+#ifndef __set_direct_map_invalid_noflush
+static inline int __set_direct_map_invalid_noflush(struct page *page)
+{
+	return set_direct_map_invalid_noflush(page);
+}
+#define __set_direct_map_invalid_noflush __set_direct_map_invalid_noflush
+#endif
+
+#ifndef __set_direct_map_default_noflush
+static inline int __set_direct_map_default_noflush(struct page *page)
+{
+	return set_direct_map_default_noflush(page);
+}
+#define __set_direct_map_default_noflush __set_direct_map_default_noflush
+#endif
 #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
 
 #ifdef CONFIG_X86_64
-- 
2.55.0.970.g62bdec98f9-goog