s390/vtime: use cpu alternative for stck/stckf

Use a cpu alternative to switch between stck and stckf instead of
making it compile time dependent. This will also make kernels compiled
for old machines, but running on newer machines, use stckf.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 978a35ea6081f3c01e998600c45ec95d05ff5840..73c7afcc0527a457d25b2a68543c8369f0395995 100644 (file)
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -13,7 +13,7 @@
 #include <linux/timex.h>
 #include <linux/types.h>
 #include <linux/time.h>
-
+#include <asm/alternative.h>
 #include <asm/vtimer.h>
 #include <asm/vtime.h>
 #include <asm/cpu_mf.h>
@@ -128,16 +128,13 @@ static int do_account_vtime(struct task_struct *tsk)
 
        timer = S390_lowcore.last_update_timer;
        clock = S390_lowcore.last_update_clock;
-       asm volatile(
-               "       stpt    %0\n"   /* Store current cpu timer value */
-#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
-               "       stckf   %1"     /* Store current tod clock value */
-#else
-               "       stck    %1"     /* Store current tod clock value */
-#endif
-               : "=Q" (S390_lowcore.last_update_timer),
-                 "=Q" (S390_lowcore.last_update_clock)
-               : : "cc");
+       /* Use STORE CLOCK by default, STORE CLOCK FAST if available. */
+       alternative_io("stpt %0\n .insn s,0xb2050000,%1\n",
+                      "stpt %0\n .insn s,0xb27c0000,%1\n",
+                      25,
+                      ASM_OUTPUT2("=Q" (S390_lowcore.last_update_timer),
+                                  "=Q" (S390_lowcore.last_update_clock)),
+                      ASM_NO_INPUT_CLOBBER("cc"));
        clock = S390_lowcore.last_update_clock - clock;
        timer -= S390_lowcore.last_update_timer;