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srcu: Add srcu_read_lock_fast_notrace() and srcu_read_unlock_fast_notrace()

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This commit adds no-trace variants of the srcu_read_lock_fast() and
srcu_read_unlock_fast() functions for tracing use.

[ paulmck: Apply notrace feedback from Joel Fernandes, Steven Rostedt, and Mathieu Desnoyers. ]
[ paulmck: Apply excess-notrace feedback from Boqun Feng. ]

Link: https://lore.kernel.org/all/20250721162433.10454-1-paulmck@kernel.org
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: <bpf@vger.kernel.org>
This commit is contained in:
Paul E. McKenney
2025-07-16 09:12:16 -07:00
parent f39494089a
commit 7e2a2d060d
2 changed files with 28 additions and 2 deletions
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25
include/linux/srcu.h
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@@ -282,6 +282,20 @@ static inline struct srcu_ctr __percpu *srcu_read_lock_fast(struct srcu_struct *
return retval;
}
/*
* Used by tracing, cannot be traced and cannot call lockdep.
* See srcu_read_lock_fast() for more information.
*/
static inline struct srcu_ctr __percpu *srcu_read_lock_fast_notrace(struct srcu_struct *ssp)
__acquires(ssp)
{
struct srcu_ctr __percpu *retval;
srcu_check_read_flavor_force(ssp, SRCU_READ_FLAVOR_FAST);
retval = __srcu_read_lock_fast(ssp);
return retval;
}
/**
* srcu_down_read_fast - register a new reader for an SRCU-protected structure.
* @ssp: srcu_struct in which to register the new reader.
@@ -394,6 +408,17 @@ static inline void srcu_read_unlock_fast(struct srcu_struct *ssp, struct srcu_ct
RCU_LOCKDEP_WARN(!rcu_is_watching(), "RCU must be watching srcu_read_unlock_fast().");
}
/*
* Used by tracing, cannot be traced and cannot call lockdep.
* See srcu_read_unlock_fast() for more information.
*/
static inline void srcu_read_unlock_fast_notrace(struct srcu_struct *ssp,
struct srcu_ctr __percpu *scp) __releases(ssp)
{
srcu_check_read_flavor(ssp, SRCU_READ_FLAVOR_FAST);
__srcu_read_unlock_fast(ssp, scp);
}
/**
* srcu_up_read_fast - unregister a old reader from an SRCU-protected structure.
* @ssp: srcu_struct in which to unregister the old reader.