linux-kernel - [PATCH v2 2/3] s390/cpufeature: allow for facility bits

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Date:   Wed, 13 Jul 2022 14:56:43 +0200
From:   Steffen Eiden <seiden@...ux.ibm.com>
To:     Heiko Carstens <hca@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     nrb@...ux.ibm.com
Subject: [PATCH v2 2/3] s390/cpufeature: allow for facility bits

From: Heiko Carstens <hca@...ux.ibm.com>

Allow for facility bits to be used in cpu features.

Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@...ux.ibm.com>
---
 arch/s390/kernel/cpufeature.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/s390/kernel/cpufeature.c b/arch/s390/kernel/cpufeature.c
index 9044c75d8b38..170894730fcc 100644
--- a/arch/s390/kernel/cpufeature.c
+++ b/arch/s390/kernel/cpufeature.c
@@ -8,6 +8,7 @@
 
 enum {
 	TYPE_HWCAP,
+	TYPE_FACILITY,
 };
 
 struct s390_cpu_feature {
@@ -34,6 +35,8 @@ int cpu_have_feature(unsigned int num)
 	switch (feature->type) {
 	case TYPE_HWCAP:
 		return !!(elf_hwcap & BIT(feature->num));
+	case TYPE_FACILITY:
+		return test_facility(feature->num);
 	default:
 		WARN_ON_ONCE(1);
 		return 0;
-- 
2.35.3