[S390] boot cputime accounting
Start the cpu time accounting very early to catch the cpu time spent
for the initial kernel setup. To make the output of /proc/uptime
match the sum of all cpu accounting values of the boot cpu reset
xtime and wall_to_monotonic to sane values based on the TOD clock.
The values set by timekeeping_init are off by up to a second.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 16f8975..bba1449 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -473,7 +473,10 @@
xc 0x300(256),0x300
l %r1,5f-.LPG0(%r13)
stck 0(%r1)
-
+ spt 6f-.LPG0(%r13)
+ mvc __LC_LAST_UPDATE_CLOCK(8),0(%r1)
+ mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
+ mvc __LC_EXIT_TIMER(8),5f-.LPG0(%r13)
#ifndef CONFIG_MARCH_G5
# check processor version against MARCH_{G5,Z900,Z990,Z9_109,Z10}
stidp __LC_CPUID # store cpuid
@@ -500,8 +503,11 @@
l %r13,4f-.LPG0(%r13)
b 0(%r13)
+ .align 4
4: .long startup_continue
5: .long sched_clock_base_cc
+ .align 8
+6: .long 0x7fffffff,0xffffffff
#
# params at 10400 (setup.h)