[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, 8 insertions, 4 deletions

diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index b349f1c7fdfa..3aeca492b147 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -66,6 +66,7 @@
 #define __LC_USER_EXEC_ASCE             0x02ac
 #define __LC_CPUID                      0x02b0
 #define __LC_INT_CLOCK                  0x02c8
+#define __LC_MACHINE_FLAGS              0x02d8
 #define __LC_IRB                        0x0300
 #define __LC_PFAULT_INTPARM             0x0080
 #define __LC_CPU_TIMER_SAVE_AREA        0x00d8
@@ -110,6 +111,7 @@
 #define __LC_CPUID                      0x0320
 #define __LC_INT_CLOCK                  0x0340
 #define __LC_VDSO_PER_CPU               0x0350
+#define __LC_MACHINE_FLAGS              0x0358
 #define __LC_IRB                        0x0380
 #define __LC_PASTE                      0x03c0
 #define __LC_PFAULT_INTPARM             0x11b8
@@ -127,9 +129,9 @@
 
 #ifndef __ASSEMBLY__
 
-#include <asm/processor.h>
+#include <asm/cpuid.h>
+#include <asm/ptrace.h>
 #include <linux/types.h>
-#include <asm/sigp.h>
 
 void restart_int_handler(void);
 void ext_int_handler(void);
@@ -277,7 +279,8 @@ struct _lowcore
         __u32   ext_call_fast;                  /* 0x02c4 */
         __u64   int_clock;                      /* 0x02c8 */
         __u64   clock_comparator;               /* 0x02d0 */
-        __u8    pad_0x02d8[0x0300-0x02d8];      /* 0x02d8 */
+        __u32   machine_flags;                  /* 0x02d8 */
+        __u8    pad_0x02dc[0x0300-0x02dc];      /* 0x02dc */
 
         /* Interrupt response block */
         __u8    irb[64];                        /* 0x0300 */
@@ -381,7 +384,8 @@ struct _lowcore
         __u64   int_clock;                      /* 0x0340 */
         __u64   clock_comparator;               /* 0x0348 */
         __u64   vdso_per_cpu_data;              /* 0x0350 */
-        __u8    pad_0x0358[0x0380-0x0358];      /* 0x0358 */
+        __u64   machine_flags;                  /* 0x0358 */
+        __u8    pad_0x0360[0x0380-0x0360];      /* 0x0360 */
 
         /* Interrupt response block. */
         __u8    irb[64];                        /* 0x0380 */