[PATCH v6 04/28] s390: Move sske_frame() to a header

From: Claudio Imbrenda

Date: Mon Dec 22 2025 - 11:50:48 EST


Move the sske_frame() function to asm/pgtable.h, so it can be used in
other modules too.

Opportunistically convert the .insn opcode specification to the
appropriate mnemonic.

Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Reviewed-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>
Reviewed-by: Christoph Schlameuss <schlameuss@xxxxxxxxxxxxx>
Reviewed-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
---
arch/s390/include/asm/pgtable.h | 7 +++++++
arch/s390/mm/pageattr.c | 7 -------
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 8194a2b12ecf..73c30b811b98 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1136,6 +1136,13 @@ static inline pte_t pte_mkhuge(pte_t pte)
}
#endif

+static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
+{
+ asm volatile("sske %[skey],%[addr],1"
+ : [addr] "+a" (addr) : [skey] "d" (skey));
+ return addr;
+}
+
#define IPTE_GLOBAL 0
#define IPTE_LOCAL 1

diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index d3ce04a4b248..bb29c38ae624 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -16,13 +16,6 @@
#include <asm/asm.h>
#include <asm/set_memory.h>

-static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
-{
- asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],1,0"
- : [addr] "+a" (addr) : [skey] "d" (skey));
- return addr;
-}
-
void __storage_key_init_range(unsigned long start, unsigned long end)
{
unsigned long boundary, size;
--
2.52.0