Subject: [PATCH v5 04/26] powerpc/book3s64/pkeys: Explain key 1 reservation details

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Fri, 19 Jun 2020 19:28:28 +0530

This explains the details w.r.t key 1.

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/mm/book3s64/pkeys.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c
index 1199fc2bfaec..d60e6bfa3e03 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c
@@ -124,7 +124,10 @@ static int pkey_initialize(void)
 #else
 	os_reserved = 0;
 #endif
-	/* Bits are in LE format. */
+	/*
+	 * key 1 is recommended not to be used. PowerISA(3.0) page 1015,
+	 * programming note.
+	 */
 	reserved_allocation_mask = (0x1 << 1) | (0x1 << execute_only_key);
 
 	/* register mask is in BE format */
-- 
2.26.2