[RFC PATCH 1/3] srcu: Declare exported symbols before including srcu{tiny,tree}.h

Sean Christopherson
2026-03-09T19:31:14Z

Move the declarations of call_srcu(), cleanup_srcu_struct(), and
synchronize_srcu() above the inclusion of the implementation specific SRCU
header so that tiny SRCU can provide inline wrappers, e.g. for expedited
versions, without needing to re-declare synchronize_srcu() and call_srcu().

Opportunsitically use rcu_callback_t in the call_srcu() declaration instead
of an open coded equivalent (all implementations already use
rcu_callback_t).

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
include/linux/srcu.h | 10 +++++-----
include/linux/srcutiny.h | 2 --
2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index bb44a0bd7696..1cbc37e3b59c 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -79,6 +79,11 @@ int init_srcu_struct_fast_updown(struct srcu_struct *ssp);
// instead of smp_mb().
void __srcu_read_unlock(struct srcu_struct *ssp, int idx) __releases_shared(ssp);

+void call_srcu(struct srcu_struct *ssp, struct rcu_head *head,
+ rcu_callback_t func);
+void cleanup_srcu_struct(struct srcu_struct *ssp);
+void synchronize_srcu(struct srcu_struct *ssp);
+
#ifdef CONFIG_TINY_SRCU
#include <linux/srcutiny.h>
#elif defined(CONFIG_TREE_SRCU)
@@ -87,11 +92,6 @@ void __srcu_read_unlock(struct srcu_struct *ssp, int idx) __releases_shared(ssp)
#error "Unknown SRCU implementation specified to kernel configuration"
#endif

-void call_srcu(struct srcu_struct *ssp, struct rcu_head *head,
- void (*func)(struct rcu_head *head));
-void cleanup_srcu_struct(struct srcu_struct *ssp);
-void synchronize_srcu(struct srcu_struct *ssp);
-
#define SRCU_GET_STATE_COMPLETED 0x1

/**
diff --git a/include/linux/srcutiny.h b/include/linux/srcutiny.h
index dec7cbe015aa..4976536e8b28 100644
--- a/include/linux/srcutiny.h
+++ b/include/linux/srcutiny.h
@@ -64,8 +64,6 @@ struct srcu_usage { };
#define init_srcu_struct_fast_updown init_srcu_struct
#endif // #ifndef CONFIG_DEBUG_LOCK_ALLOC

-void synchronize_srcu(struct srcu_struct *ssp);
-
/*
* Counts the new reader in the appropriate per-CPU element of the
* srcu_struct. Can be invoked from irq/bh handlers, but the matching
--
2.53.0.473.g4a7958ca14-goog