[PATCH v2 04/12] powerpc/book3s64/pkeys: Explain key 1 reservation details

[Aneesh Kumar K.V]

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

Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
---
 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