linux-kernel - [PATCH 2/8] tracing: do not trace kernel_text

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Message-Id: <20240613-dev-andyc-dyn-ftrace-v4-v1-2-1a538e12c01e@sifive.com>
Date: Thu, 13 Jun 2024 15:11:07 +0800
From: Andy Chiu <andy.chiu@...ive.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alexghiti@...osinc.com>, Zong Li <zong.li@...ive.com>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Puranjay Mohan <puranjay@...nel.org>
Cc: Palmer Dabbelt <palmer@...osinc.com>, linux-riscv@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev, Andy Chiu <andy.chiu@...ive.com>
Subject: [PATCH 2/8] tracing: do not trace kernel_text_address()

kernel_text_address() and __kernel_text_address() are called in
arch_stack_walk() of riscv. This results in excess amount of un-related
traces when the kernel is compiled with CONFIG_TRACE_IRQFLAGS. The
situation worsens when function_graph is active, as it calls
local_irq_save/restore in each function's entry/exit. This patch adds
both functions to notrace, so they won't show up on the trace records.

Signed-off-by: Andy Chiu <andy.chiu@...ive.com>
---
 kernel/extable.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/extable.c b/kernel/extable.c
index 71f482581cab..d03fa462fa8b 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -74,7 +74,7 @@ int notrace core_kernel_text(unsigned long addr)
 	return 0;
 }
 
-int __kernel_text_address(unsigned long addr)
+int notrace __kernel_text_address(unsigned long addr)
 {
 	if (kernel_text_address(addr))
 		return 1;
@@ -91,7 +91,7 @@ int __kernel_text_address(unsigned long addr)
 	return 0;
 }
 
-int kernel_text_address(unsigned long addr)
+int notrace kernel_text_address(unsigned long addr)
 {
 	bool no_rcu;
 	int ret = 1;

-- 
2.43.0