From: Andy Chiu <andybnac@gmail.com>
To: linux-riscv@lists.infradead.org, alexghiti@rivosinc.com,
palmer@dabbelt.com
Cc: Andy Chiu <andybnac@gmail.com>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Alexandre Ghiti <alex@ghiti.fr>,
bjorn@rivosinc.com, puranjay12@gmail.com,
paul.walmsley@sifive.com, greentime.hu@sifive.com,
nick.hu@sifive.com, nylon.chen@sifive.com, eric.lin@sifive.com,
vicent.chen@sifive.com, zong.li@sifive.com,
yongxuan.wang@sifive.com, samuel.holland@sifive.com,
olivia.chu@sifive.com, c2232430@gmail.com
Subject: [PATCH v4 04/12] kernel: ftrace: export ftrace_sync_ipi
Date: Tue, 8 Apr 2025 02:08:28 +0800 [thread overview]
Message-ID: <20250407180838.42877-4-andybnac@gmail.com> (raw)
In-Reply-To: <20250407180838.42877-1-andybnac@gmail.com>
The following ftrace patch for riscv uses a data store to update ftrace
function. Therefore, a romote fence is required to order it against
function_trace_op updates. The mechanism is similar to the fence between
function_trace_op and update_ftrace_func in the generic ftrace, so we
leverage the same ftrace_sync_ipi function.
Signed-off-by: Andy Chiu <andybnac@gmail.com>
---
include/linux/ftrace.h | 1 +
kernel/trace/ftrace.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index fbabc3d848b3..0d4eec574707 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -807,6 +807,7 @@ extern void ftrace_call(void);
extern void ftrace_regs_call(void);
extern void mcount_call(void);
+void ftrace_sync_ipi(void *data);
void ftrace_modify_all_code(int command);
#ifndef FTRACE_ADDR
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ee662f380b61..d06bd4a046de 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -188,7 +188,7 @@ static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,
op->saved_func(ip, parent_ip, op, fregs);
}
-static void ftrace_sync_ipi(void *data)
+void ftrace_sync_ipi(void *data)
{
/* Probably not needed, but do it anyway */
smp_rmb();
--
2.39.3 (Apple Git-145)
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next prev parent reply other threads:[~2025-04-07 18:52 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-07 18:08 [PATCH v4 01/12] riscv: ftrace: support fastcc in Clang for WITH_ARGS Andy Chiu
2025-04-07 18:08 ` [PATCH v4 02/12] riscv: ftrace factor out code defined by !WITH_ARG Andy Chiu
2025-04-07 18:08 ` [PATCH v4 03/12] riscv: ftrace: align patchable functions to 4 Byte boundary Andy Chiu
2025-04-07 18:08 ` Andy Chiu [this message]
2025-04-08 22:31 ` [PATCH v4 04/12] kernel: ftrace: export ftrace_sync_ipi kernel test robot
2025-04-23 8:13 ` Alexandre Ghiti
2025-04-07 18:08 ` [PATCH v4 05/12] riscv: ftrace: prepare ftrace for atomic code patching Andy Chiu
2025-04-11 13:15 ` Robbin Ehn
2025-04-23 8:22 ` Alexandre Ghiti
2025-05-05 14:06 ` Alexandre Ghiti
2025-05-07 14:18 ` Andy Chiu
2025-05-07 14:35 ` Alexandre Ghiti
2025-04-07 18:08 ` [PATCH v4 06/12] riscv: ftrace: do not use stop_machine to update code Andy Chiu
2025-04-07 18:08 ` [PATCH v4 07/12] riscv: vector: Support calling schedule() for preemptible Vector Andy Chiu
2025-04-07 18:08 ` [PATCH v4 08/12] riscv: add a data fence for CMODX in the kernel mode Andy Chiu
2025-04-07 18:08 ` [PATCH v4 09/12] riscv: ftrace: support PREEMPT Andy Chiu
2025-04-07 18:08 ` [PATCH v4 10/12] riscv: Implement HAVE_DYNAMIC_FTRACE_WITH_CALL_OPS Andy Chiu
2026-02-21 12:15 ` Conor Dooley
2026-02-23 15:18 ` Puranjay Mohan
2026-02-23 15:27 ` Conor Dooley
2026-02-23 15:41 ` Puranjay Mohan
2026-02-23 16:29 ` Conor Dooley
2026-02-23 17:36 ` Puranjay Mohan
2026-02-23 17:41 ` Conor Dooley
2025-04-07 18:08 ` [PATCH v4 11/12] riscv: ftrace: support direct call using call_ops Andy Chiu
2025-04-07 18:08 ` [PATCH v4 12/12] riscv: Documentation: add a description about dynamic ftrace Andy Chiu
2025-04-11 12:02 ` Robbin Ehn
2025-04-10 20:05 ` [PATCH v4 01/12] riscv: ftrace: support fastcc in Clang for WITH_ARGS Björn Töpel
2025-05-07 13:58 ` Andy Chiu
2025-06-02 22:12 ` patchwork-bot+linux-riscv
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