[PATCH v9 03/10] set_memory.h: Introduce can_set_direct_map_range()

[Vincent Donnefort]

While can_set_direct_map() tells whether the direct map can be modified
globally, can_set_direct_map_range() checks if a specific range can be
modified. e.g. if mapped at PTE-level.

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

diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index 3030d9245f5a..88175c3fa751 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -44,6 +44,12 @@ static inline bool kernel_page_present(struct page *page)
 {
 	return true;
 }
+
+static inline bool can_set_direct_map_range(struct page *page,
+					    unsigned long nr_pages)
+{
+	return false;
+}
 #else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
 /*
  * Some architectures, e.g. ARM64 can disable direct map modifications at
@@ -56,6 +62,14 @@ static inline bool can_set_direct_map(void)
 }
 #define can_set_direct_map can_set_direct_map
 #endif
+
+#ifndef can_set_direct_map_range
+static inline bool can_set_direct_map_range(struct page *page, unsigned long nr_pages)
+{
+	return can_set_direct_map();
+}
+#define can_set_direct_map_range can_set_direct_map_range
+#endif
 #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
 
 #ifdef CONFIG_X86_64
-- 
2.55.0.970.g62bdec98f9-goog