[PATCH RFC v10 02/22] set_memory: Introduce set_direct_map_pkey() stub

[Kevin Brodsky]

Introduce a new function, set_direct_map_pkey(), which sets the
protection key (pkey) of pages in the specified direct map range.
Architectures implementing kernel pkeys (kpkeys) must provide a
suitable implementation; an empty stub is added as fallback.

Reviewed-by: Yeoreum Yun <yeoreum.yun@xxxxxxx>
Signed-off-by: Kevin Brodsky <kevin.brodsky@xxxxxxx>
---
 include/linux/set_memory.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index 27c32fbabfec..6172f1ecad35 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -190,4 +190,11 @@ static inline int set_memory_decrypted(unsigned long addr, int numpages)
 }
 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
 
+#ifndef CONFIG_ARCH_HAS_KPKEYS
+static inline int set_direct_map_pkey(unsigned long addr, int numpages, int pkey)
+{
+	return 0;
+}
+#endif
+
 #endif /* _LINUX_SET_MEMORY_H_ */

-- 
2.56.0