From: "Onur Özkan" <work@onurozkan.dev>
To: rcu@vger.kernel.org, rust-for-linux@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: ojeda@kernel.org, boqun@kernel.org, gary@garyguo.net,
bjorn3_gh@protonmail.com, lossin@kernel.org,
a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu,
dakr@kernel.org, peterz@infradead.org, fujita.tomonori@gmail.com,
tamird@kernel.org, jiangshanlai@gmail.com, paulmck@kernel.org,
josh@joshtriplett.org, rostedt@goodmis.org,
mathieu.desnoyers@efficios.com, "Onur Özkan" <work@onurozkan.dev>
Subject: [PATCH v9 1/4] rust: helpers: add SRCU helpers
Date: Fri, 29 May 2026 16:39:51 +0300 [thread overview]
Message-ID: <20260529134004.396743-2-work@onurozkan.dev> (raw)
In-Reply-To: <20260529134004.396743-1-work@onurozkan.dev>
Add helper wrappers for SRCU functions that are exposed to Rust
through generated bindings.
Signed-off-by: Onur Özkan <work@onurozkan.dev>
---
include/linux/srcu.h | 29 ++++++++++++++++++++---------
kernel/rcu/srcutiny.c | 10 +++++-----
kernel/rcu/srcutree.c | 9 +++++----
rust/helpers/helpers.c | 1 +
rust/helpers/srcu.c | 30 ++++++++++++++++++++++++++++++
5 files changed, 61 insertions(+), 18 deletions(-)
create mode 100644 rust/helpers/srcu.c
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index 81b1938512d5..a028a5b5ebef 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -25,20 +25,19 @@ context_lock_struct(srcu_struct, __reentrant_ctx_lock);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
-int __init_srcu_struct(struct srcu_struct *ssp, const char *name, struct lock_class_key *key);
+int init_srcu_struct_lockdep(struct srcu_struct *ssp, const char *name,
+ struct lock_class_key *key);
+static inline int __init_srcu_struct(struct srcu_struct *ssp, const char *name,
+ struct lock_class_key *key)
+{
+ return init_srcu_struct_lockdep(ssp, name, key);
+}
#ifndef CONFIG_TINY_SRCU
int __init_srcu_struct_fast(struct srcu_struct *ssp, const char *name, struct lock_class_key *key);
int __init_srcu_struct_fast_updown(struct srcu_struct *ssp, const char *name,
struct lock_class_key *key);
#endif // #ifndef CONFIG_TINY_SRCU
-#define init_srcu_struct(ssp) \
-({ \
- static struct lock_class_key __srcu_key; \
- \
- __init_srcu_struct((ssp), #ssp, &__srcu_key); \
-})
-
#define init_srcu_struct_fast(ssp) \
({ \
static struct lock_class_key __srcu_key; \
@@ -56,7 +55,12 @@ int __init_srcu_struct_fast_updown(struct srcu_struct *ssp, const char *name,
#define __SRCU_DEP_MAP_INIT(srcu_name) .dep_map = { .name = #srcu_name },
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
-int init_srcu_struct(struct srcu_struct *ssp);
+int init_srcu_struct_generic(struct srcu_struct *ssp);
+static inline int __init_srcu_struct(struct srcu_struct *ssp, const char *name,
+ struct lock_class_key *key)
+{
+ return init_srcu_struct_generic(ssp);
+}
#ifndef CONFIG_TINY_SRCU
int init_srcu_struct_fast(struct srcu_struct *ssp);
int init_srcu_struct_fast_updown(struct srcu_struct *ssp);
@@ -65,6 +69,13 @@ int init_srcu_struct_fast_updown(struct srcu_struct *ssp);
#define __SRCU_DEP_MAP_INIT(srcu_name)
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
+#define init_srcu_struct(ssp) \
+({ \
+ static struct lock_class_key __srcu_key; \
+ \
+ __init_srcu_struct((ssp), #ssp, &__srcu_key); \
+})
+
/* Values for SRCU Tree srcu_data ->srcu_reader_flavor, but also used by rcutorture. */
#define SRCU_READ_FLAVOR_NORMAL 0x1 // srcu_read_lock().
#define SRCU_READ_FLAVOR_NMI 0x2 // srcu_read_lock_nmisafe().
diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c
index a2e2d516e51b..780a95e8cad7 100644
--- a/kernel/rcu/srcutiny.c
+++ b/kernel/rcu/srcutiny.c
@@ -48,15 +48,15 @@ static int init_srcu_struct_fields(struct srcu_struct *ssp)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
-int __init_srcu_struct(struct srcu_struct *ssp, const char *name,
- struct lock_class_key *key)
+int init_srcu_struct_lockdep(struct srcu_struct *ssp, const char *name,
+ struct lock_class_key *key)
{
/* Don't re-initialize a lock while it is held. */
debug_check_no_locks_freed((void *)ssp, sizeof(*ssp));
lockdep_init_map(&ssp->dep_map, name, key, 0);
return init_srcu_struct_fields(ssp);
}
-EXPORT_SYMBOL_GPL(__init_srcu_struct);
+EXPORT_SYMBOL_GPL(init_srcu_struct_lockdep);
#else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -68,11 +68,11 @@ EXPORT_SYMBOL_GPL(__init_srcu_struct);
* to any other function. Each srcu_struct represents a separate domain
* of SRCU protection.
*/
-int init_srcu_struct(struct srcu_struct *ssp)
+int init_srcu_struct_generic(struct srcu_struct *ssp)
{
return init_srcu_struct_fields(ssp);
}
-EXPORT_SYMBOL_GPL(init_srcu_struct);
+EXPORT_SYMBOL_GPL(init_srcu_struct_generic);
#endif /* #else #ifdef CONFIG_DEBUG_LOCK_ALLOC */
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 0d01cd8c4b4a..45154630c54e 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -266,12 +266,13 @@ __init_srcu_struct_common(struct srcu_struct *ssp, const char *name, struct lock
return init_srcu_struct_fields(ssp, false);
}
-int __init_srcu_struct(struct srcu_struct *ssp, const char *name, struct lock_class_key *key)
+int init_srcu_struct_lockdep(struct srcu_struct *ssp, const char *name,
+ struct lock_class_key *key)
{
ssp->srcu_reader_flavor = 0;
return __init_srcu_struct_common(ssp, name, key);
}
-EXPORT_SYMBOL_GPL(__init_srcu_struct);
+EXPORT_SYMBOL_GPL(init_srcu_struct_lockdep);
int __init_srcu_struct_fast(struct srcu_struct *ssp, const char *name, struct lock_class_key *key)
{
@@ -301,12 +302,12 @@ EXPORT_SYMBOL_GPL(__init_srcu_struct_fast_updown);
* to any other function. Each srcu_struct represents a separate domain
* of SRCU protection.
*/
-int init_srcu_struct(struct srcu_struct *ssp)
+int init_srcu_struct_generic(struct srcu_struct *ssp)
{
ssp->srcu_reader_flavor = 0;
return init_srcu_struct_fields(ssp, false);
}
-EXPORT_SYMBOL_GPL(init_srcu_struct);
+EXPORT_SYMBOL_GPL(init_srcu_struct_generic);
/**
* init_srcu_struct_fast - initialize a fast-reader sleep-RCU structure
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 625921e27dfb..f3562d3b3888 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -88,6 +88,7 @@
#include "signal.c"
#include "slab.c"
#include "spinlock.c"
+#include "srcu.c"
#include "sync.c"
#include "task.c"
#include "time.c"
diff --git a/rust/helpers/srcu.c b/rust/helpers/srcu.c
new file mode 100644
index 000000000000..225b3bf9334a
--- /dev/null
+++ b/rust/helpers/srcu.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/srcu.h>
+
+__rust_helper int rust_helper_init_srcu_struct_with_key(struct srcu_struct *ssp,
+ const char *name,
+ struct lock_class_key *key)
+{
+ return __init_srcu_struct(ssp, name, key);
+}
+
+__rust_helper int rust_helper_srcu_read_lock(struct srcu_struct *ssp)
+{
+ return srcu_read_lock(ssp);
+}
+
+__rust_helper void rust_helper_srcu_read_unlock(struct srcu_struct *ssp, int idx)
+{
+ srcu_read_unlock(ssp, idx);
+}
+
+__rust_helper void rust_helper_srcu_barrier(struct srcu_struct *ssp)
+{
+ srcu_barrier(ssp);
+}
+
+__rust_helper void rust_helper_synchronize_srcu_expedited(struct srcu_struct *ssp)
+{
+ synchronize_srcu_expedited(ssp);
+}
--
2.51.2
next prev parent reply other threads:[~2026-05-29 13:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-29 13:39 [PATCH v9 0/4] rust: add SRCU abstraction Onur Özkan
2026-05-29 13:39 ` Onur Özkan [this message]
2026-06-04 18:40 ` [PATCH v9 1/4] rust: helpers: add SRCU helpers Paul E. McKenney
2026-06-04 18:42 ` Paul E. McKenney
2026-06-05 6:32 ` Onur Özkan
2026-05-29 13:39 ` [PATCH v9 2/4] srcu: expose srcu_readers_active() Onur Özkan
2026-06-04 22:29 ` Paul E. McKenney
2026-05-29 13:39 ` [PATCH v9 3/4] rust: sync: add SRCU abstraction Onur Özkan
2026-05-29 13:39 ` [PATCH v9 4/4] MAINTAINERS: add Rust SRCU files to SRCU entry Onur Özkan
2026-06-10 19:50 ` kernel test robot
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