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srcu: Add notrace variants of srcu_read_{lock,unlock} 

This is needed for a future tracepoint patch that uses srcu, and to make
sure it doesn't call into lockdep.

tracepoint code already calls notrace variants for rcu_read_lock_sched
so this patch does the same for srcu which will be used in a later
patch. Keeps it consistent with rcu-sched.

[Joel: Added commit message]
Link: http://lkml.kernel.org/r/20180628182149.226164-2-joel@joelfernandes.org

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Paul McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
hifive-unleashed-5.1
Paul McKenney 2018-06-28 11:21:43 -07:00 committed by Steven Rostedt (VMware)
parent 3e536e222f
commit 1f45a4db36
1 changed files with 17 additions and 0 deletions
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17
include/linux/srcu.h
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@ -195,6 +195,16 @@ static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp)
return retval;
}
/* Used by tracing, cannot be traced and cannot invoke lockdep. */
static inline notrace int
srcu_read_lock_notrace(struct srcu_struct *sp) __acquires(sp)
{
int retval;
retval = __srcu_read_lock(sp);
return retval;
}
/**
* srcu_read_unlock - unregister a old reader from an SRCU-protected structure.
* @sp: srcu_struct in which to unregister the old reader.
@ -209,6 +219,13 @@ static inline void srcu_read_unlock(struct srcu_struct *sp, int idx)
__srcu_read_unlock(sp, idx);
}
/* Used by tracing, cannot be traced and cannot call lockdep. */
static inline notrace void
srcu_read_unlock_notrace(struct srcu_struct *sp, int idx) __releases(sp)
{
__srcu_read_unlock(sp, idx);
}
/**
* smp_mb__after_srcu_read_unlock - ensure full ordering after srcu_read_unlock
*