[PATCH v6 05/23] powerpc/book3s64/pkeys: Explain key 1 reservation details
From: Aneesh Kumar K.V <hidden>
Date: 2020-07-09 03:40:14
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
This explains the details w.r.t key 1. Signed-off-by: Aneesh Kumar K.V <redacted> --- 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 d69b4cfc5792..6ff9fe4112ef 100644
--- a/arch/powerpc/mm/book3s64/pkeys.c
+++ b/arch/powerpc/mm/book3s64/pkeys.c@@ -128,7 +128,10 @@ 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