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| author |   David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-07-14 13:38:06 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-08-29 11:04:54 +0200 |
| commit | ca64f63901a054af755994648bf6835047c71cbb (patch) | |
| tree | 03828e9514e6d23c0f5fb8f3e49406617f837059 /arch/s390/kernel/time.c | |
| parent | s390/time: simplify stp time syncs (diff) | |
| download | linux-dev-ca64f63901a054af755994648bf6835047c71cbb.tar.xz linux-dev-ca64f63901a054af755994648bf6835047c71cbb.zip | |
s390/time: cleanup etr leftovers
There are still some etr leftovers and wrong comments, let's clean that up.
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/time.c')
| -rw-r--r-- | arch/s390/kernel/time.c | 30 |
1 files changed, 9 insertions, 21 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index c95e98d49b38..5e7237dc39fc 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -318,10 +318,8 @@ static DEFINE_PER_CPU(atomic_t, clock_sync_word); static DEFINE_MUTEX(clock_sync_mutex); static unsigned long clock_sync_flags; -#define CLOCK_SYNC_HAS_ETR 0 -#define CLOCK_SYNC_HAS_STP 1 -#define CLOCK_SYNC_ETR 2 -#define CLOCK_SYNC_STP 3 +#define CLOCK_SYNC_HAS_STP 0 +#define CLOCK_SYNC_STP 1 /* * The get_clock function for the physical clock. It will get the current @@ -343,34 +341,32 @@ int get_phys_clock(unsigned long long *clock) if (sw0 == sw1 && (sw0 & 0x80000000U)) /* Success: time is in sync. */ return 0; - if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags) && - !test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) + if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags)) return -EOPNOTSUPP; - if (!test_bit(CLOCK_SYNC_ETR, &clock_sync_flags) && - !test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) + if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags)) return -EACCES; return -EAGAIN; } EXPORT_SYMBOL(get_phys_clock); /* - * Make get_sync_clock return -EAGAIN. + * Make get_phys_clock() return -EAGAIN. */ static void disable_sync_clock(void *dummy) { atomic_t *sw_ptr = this_cpu_ptr(&clock_sync_word); /* - * Clear the in-sync bit 2^31. All get_sync_clock calls will + * Clear the in-sync bit 2^31. All get_phys_clock calls will * fail until the sync bit is turned back on. In addition * increase the "sequence" counter to avoid the race of an - * etr event and the complete recovery against get_sync_clock. + * stp event and the complete recovery against get_phys_clock. */ atomic_andnot(0x80000000, sw_ptr); atomic_inc(sw_ptr); } /* - * Make get_sync_clock return 0 again. + * Make get_phys_clock() return 0 again. * Needs to be called from a context disabled for preemption. */ static void enable_sync_clock(void) @@ -393,7 +389,7 @@ static inline int check_sync_clock(void) return rc; } -/* Single threaded workqueue used for etr and stp sync events */ +/* Single threaded workqueue used for stp sync events */ static struct workqueue_struct *time_sync_wq; static void __init time_init_wq(void) @@ -407,20 +403,12 @@ struct clock_sync_data { atomic_t cpus; int in_sync; unsigned long long fixup_cc; - int etr_port; - struct etr_aib *etr_aib; }; static void clock_sync_cpu(struct clock_sync_data *sync) { atomic_dec(&sync->cpus); enable_sync_clock(); - /* - * This looks like a busy wait loop but it isn't. etr_sync_cpus - * is called on all other cpus while the TOD clocks is stopped. - * __udelay will stop the cpu on an enabled wait psw until the - * TOD is running again. - */ while (sync->in_sync == 0) { __udelay(1); /* |