[RFC PATCH v5 02/18] set_memory: Introduce set_memory_pkey() stub

Kevin Brodsky
2025-08-15T08:55:39Z

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

Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
---
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 3030d9245f5a..7b3a8bfde3c6 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -84,4 +84,11 @@ 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_memory_pkey(unsigned long addr, int numpages, int pkey)
+{
+ return 0;
+}
+#endif
+
#endif /* _LINUX_SET_MEMORY_H_ */
--
2.47.0