[S390] s390: move machine flags to lowcore

Currently the storage of the machine flags is a globally exported unsigned
long long variable. By moving the storage location into the lowcore struct we
allow assembler code to check machine_flags directly even without needing a
register. Addtionally the lowcore and therefore the machine flags too will be
in cache most of the time.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index e8bd6ac22c99..38b0fc221ed7 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -14,6 +14,7 @@
 
 #ifdef __KERNEL__
 
+#include <asm/lowcore.h>
 #include <asm/types.h>
 
 #define PARMAREA                0x10400
@@ -63,7 +64,6 @@ extern unsigned int s390_noexec;
 /*
  * Machine features detected in head.S
  */
-extern unsigned long machine_flags;
 
 #define MACHINE_FLAG_VM         (1UL << 0)
 #define MACHINE_FLAG_IEEE       (1UL << 1)
@@ -77,28 +77,28 @@ extern unsigned long machine_flags;
 #define MACHINE_FLAG_HPAGE      (1UL << 10)
 #define MACHINE_FLAG_PFMF       (1UL << 11)
 
-#define MACHINE_IS_VM           (machine_flags & MACHINE_FLAG_VM)
-#define MACHINE_IS_KVM          (machine_flags & MACHINE_FLAG_KVM)
-#define MACHINE_HAS_DIAG9C      (machine_flags & MACHINE_FLAG_DIAG9C)
+#define MACHINE_IS_VM           (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
+#define MACHINE_IS_KVM          (S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
+#define MACHINE_HAS_DIAG9C      (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG9C)
 
 #ifndef __s390x__
-#define MACHINE_HAS_IEEE        (machine_flags & MACHINE_FLAG_IEEE)
-#define MACHINE_HAS_CSP         (machine_flags & MACHINE_FLAG_CSP)
+#define MACHINE_HAS_IEEE        (S390_lowcore.machine_flags & MACHINE_FLAG_IEEE)
+#define MACHINE_HAS_CSP         (S390_lowcore.machine_flags & MACHINE_FLAG_CSP)
 #define MACHINE_HAS_IDTE        (0)
 #define MACHINE_HAS_DIAG44      (1)
-#define MACHINE_HAS_MVPG        (machine_flags & MACHINE_FLAG_MVPG)
+#define MACHINE_HAS_MVPG        (S390_lowcore.machine_flags & MACHINE_FLAG_MVPG)
 #define MACHINE_HAS_MVCOS       (0)
 #define MACHINE_HAS_HPAGE       (0)
 #define MACHINE_HAS_PFMF        (0)
 #else /* __s390x__ */
 #define MACHINE_HAS_IEEE        (1)
 #define MACHINE_HAS_CSP         (1)
-#define MACHINE_HAS_IDTE        (machine_flags & MACHINE_FLAG_IDTE)
-#define MACHINE_HAS_DIAG44      (machine_flags & MACHINE_FLAG_DIAG44)
+#define MACHINE_HAS_IDTE        (S390_lowcore.machine_flags & MACHINE_FLAG_IDTE)
+#define MACHINE_HAS_DIAG44      (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG44)
 #define MACHINE_HAS_MVPG        (1)
-#define MACHINE_HAS_MVCOS       (machine_flags & MACHINE_FLAG_MVCOS)
-#define MACHINE_HAS_HPAGE       (machine_flags & MACHINE_FLAG_HPAGE)
-#define MACHINE_HAS_PFMF        (machine_flags & MACHINE_FLAG_PFMF)
+#define MACHINE_HAS_MVCOS       (S390_lowcore.machine_flags & MACHINE_FLAG_MVCOS)
+#define MACHINE_HAS_HPAGE       (S390_lowcore.machine_flags & MACHINE_FLAG_HPAGE)
+#define MACHINE_HAS_PFMF        (S390_lowcore.machine_flags & MACHINE_FLAG_PFMF)
 #endif /* __s390x__ */
 
 #define ZFCPDUMP_HSA_SIZE       (32UL<<20)