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Message-ID: <20241001211543.qdjl4pyfhehxqfk7@treble>
Date: Tue, 1 Oct 2024 14:15:43 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Peter Zijlstra <peterz@...radead.org>,
Jason Baron <jbaron@...mai.com>, Ard Biesheuvel <ardb@...nel.org>,
Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Andreas Hindborg <a.hindborg@...nel.org>,
linux-trace-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
linux-arch@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Sean Christopherson <seanjc@...gle.com>,
Uros Bizjak <ubizjak@...il.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>,
Mark Rutland <mark.rutland@....com>,
Ryan Roberts <ryan.roberts@....com>, Fuad Tabba <tabba@...gle.com>,
linux-arm-kernel@...ts.infradead.org,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Anup Patel <apatel@...tanamicro.com>,
Andrew Jones <ajones@...tanamicro.com>,
Alexandre Ghiti <alexghiti@...osinc.com>,
Conor Dooley <conor.dooley@...rochip.com>,
Samuel Holland <samuel.holland@...ive.com>,
linux-riscv@...ts.infradead.org,
Huacai Chen <chenhuacai@...nel.org>,
WANG Xuerui <kernel@...0n.name>, Bibo Mao <maobibo@...ngson.cn>,
Tiezhu Yang <yangtiezhu@...ngson.cn>,
Andrew Morton <akpm@...ux-foundation.org>,
Tianrui Zhao <zhaotianrui@...ngson.cn>, loongarch@...ts.linux.dev
Subject: Re: [PATCH v9 1/5] rust: add generic static_key_false
On Tue, Oct 01, 2024 at 01:29:58PM +0000, Alice Ryhl wrote:
> Add just enough support for static key so that we can use it from
> tracepoints. Tracepoints rely on `static_key_false` even though it is
> deprecated, so we add the same functionality to Rust.
Instead of extending the old deprecated static key interface into Rust,
can we just change tracepoints to use the new one?
/me makes a note to go convert the other users...
From: Josh Poimboeuf <jpoimboe@...nel.org>
Subject: [PATCH] tracepoints: Use new static branch API
The old static key API based on 'struct static_key' is deprecated.
Convert tracepoints to use the new API.
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
include/linux/tracepoint-defs.h | 4 ++--
include/linux/tracepoint.h | 8 ++++----
kernel/tracepoint.c | 4 ++--
3 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/include/linux/tracepoint-defs.h b/include/linux/tracepoint-defs.h
index 4dc4955f0fbf..60a6e8314d4c 100644
--- a/include/linux/tracepoint-defs.h
+++ b/include/linux/tracepoint-defs.h
@@ -31,7 +31,7 @@ struct tracepoint_func {
struct tracepoint {
const char *name; /* Tracepoint name */
- struct static_key key;
+ struct static_key_false key;
struct static_call_key *static_call_key;
void *static_call_tramp;
void *iterator;
@@ -83,7 +83,7 @@ struct bpf_raw_event_map {
#ifdef CONFIG_TRACEPOINTS
# define tracepoint_enabled(tp) \
- static_key_false(&(__tracepoint_##tp).key)
+ static_branch_unlikely(&(__tracepoint_##tp).key)
#else
# define tracepoint_enabled(tracepoint) false
#endif
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 6be396bb4297..ab5162fc3e4a 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -228,7 +228,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
#define __DECLARE_TRACE_RCU(name, proto, args, cond) \
static inline void trace_##name##_rcuidle(proto) \
{ \
- if (static_key_false(&__tracepoint_##name.key)) \
+ if (static_branch_unlikely(&__tracepoint_##name.key)) \
__DO_TRACE(name, \
TP_ARGS(args), \
TP_CONDITION(cond), 1); \
@@ -254,7 +254,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
extern struct tracepoint __tracepoint_##name; \
static inline void trace_##name(proto) \
{ \
- if (static_key_false(&__tracepoint_##name.key)) \
+ if (static_branch_unlikely(&__tracepoint_##name.key)) \
__DO_TRACE(name, \
TP_ARGS(args), \
TP_CONDITION(cond), 0); \
@@ -291,7 +291,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
static inline bool \
trace_##name##_enabled(void) \
{ \
- return static_key_false(&__tracepoint_##name.key); \
+ return static_branch_unlikely(&__tracepoint_##name.key);\
}
/*
@@ -308,7 +308,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
struct tracepoint __tracepoint_##_name __used \
__section("__tracepoints") = { \
.name = __tpstrtab_##_name, \
- .key = STATIC_KEY_INIT_FALSE, \
+ .key = STATIC_KEY_FALSE_INIT, \
.static_call_key = &STATIC_CALL_KEY(tp_func_##_name), \
.static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
.iterator = &__traceiter_##_name, \
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 8d1507dd0724..dc160cc0b616 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -358,7 +358,7 @@ static int tracepoint_add_func(struct tracepoint *tp,
tracepoint_update_call(tp, tp_funcs);
/* Both iterator and static call handle NULL tp->funcs */
rcu_assign_pointer(tp->funcs, tp_funcs);
- static_key_enable(&tp->key);
+ static_branch_enable(&tp->key);
break;
case TP_FUNC_2: /* 1->2 */
/* Set iterator static call */
@@ -414,7 +414,7 @@ static int tracepoint_remove_func(struct tracepoint *tp,
if (tp->unregfunc && static_key_enabled(&tp->key))
tp->unregfunc();
- static_key_disable(&tp->key);
+ static_branch_disable(&tp->key);
/* Set iterator static call */
tracepoint_update_call(tp, tp_funcs);
/* Both iterator and static call handle NULL tp->funcs */
--
2.46.0
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