After commit eb1f00237aca ("lockdep,trace: Expose tracepoints") the
lock tracepoints are visible to lockdep and RCU-lockdep is finding a
bunch more RCU violations that were previously hidden.
Switch the idle->seqcount over to using raw_write_*() to avoid the
lockdep annotation and thus the lock tracepoints.
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
arch/s390/kernel/idle.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/s390/kernel/idle.c
+++ b/arch/s390/kernel/idle.c
@@ -39,14 +39,13 @@ void enabled_wait(void)
local_irq_restore(flags);
/* Account time spent with enabled wait psw loaded as idle time. */
- /* XXX seqcount has tracepoints that require RCU */
- write_seqcount_begin(&idle->seqcount);
+ raw_write_seqcount_begin(&idle->seqcount);
idle_time = idle->clock_idle_exit - idle->clock_idle_enter;
idle->clock_idle_enter = idle->clock_idle_exit = 0ULL;
idle->idle_time += idle_time;
idle->idle_count++;
account_idle_time(cputime_to_nsecs(idle_time));
- write_seqcount_end(&idle->seqcount);
+ raw_write_seqcount_end(&idle->seqcount);
}
NOKPROBE_SYMBOL(enabled_wait);
