From: Aneesh Kumar K.V Date: Thu, 9 Jul 2020 03:29:28 +0000 (+0530) Subject: powerpc/book3s64/pkeys: Explain key 1 reservation details X-Git-Tag: v5.10.7~1910^2~226 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1f404058e2911afe08417ef82f17aba6adccfc63;p=platform%2Fkernel%2Flinux-rpi.git powerpc/book3s64/pkeys: Explain key 1 reservation details This explains the details w.r.t key 1. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200709032946.881753-6-aneesh.kumar@linux.ibm.com --- diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c index 82ace6a..ee27f18 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 */