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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2014-09-30 17:37:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-10-09 09:14:02 +0200
commitfe0f49768d807a8fe6336b097feb8c4441951710 (patch)
tree5473c103c550bfa72871b4418521f7836a24d6b1 /arch/s390/include/asm
parenta9b1649917f0d2058022eda06082f9d299a06354 (diff)
s390/nohz: use a per-cpu flag for arch_needs_cpu
Move the nohz_delay bit from the s390_idle data structure to the per-cpu flags. Clear the nohz delay flag in __cpu_disable and remove the cpu hotplug notifier that used to do this. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm')
-rw-r--r--arch/s390/include/asm/cputime.h8
-rw-r--r--arch/s390/include/asm/processor.h4
2 files changed, 4 insertions, 8 deletions
diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index f65bd3634519..01887b1fade5 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -166,7 +166,6 @@ static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
}
struct s390_idle_data {
- int nohz_delay;
unsigned int sequence;
unsigned long long idle_count;
unsigned long long idle_time;
@@ -182,11 +181,4 @@ cputime64_t s390_get_idle_time(int cpu);
#define arch_idle_time(cpu) s390_get_idle_time(cpu)
-static inline int s390_nohz_delay(int cpu)
-{
- return __get_cpu_var(s390_idle).nohz_delay != 0;
-}
-
-#define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
-
#endif /* _S390_CPUTIME_H */
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index e568fc8a7250..bc796d73129b 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -13,9 +13,11 @@
#define CIF_MCCK_PENDING 0 /* machine check handling is pending */
#define CIF_ASCE 1 /* user asce needs fixup / uaccess */
+#define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */
#define _CIF_MCCK_PENDING (1<<CIF_MCCK_PENDING)
#define _CIF_ASCE (1<<CIF_ASCE)
+#define _CIF_NOHZ_DELAY (1<<CIF_NOHZ_DELAY)
#ifndef __ASSEMBLY__
@@ -43,6 +45,8 @@ static inline int test_cpu_flag(int flag)
return !!(S390_lowcore.cpu_flags & (1U << flag));
}
+#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
+
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").

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