linux-kernel - [PATCH v6 02/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires

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Message-ID: <176960936178.182525.3819325751118979093.stgit@devnote2>
Date: Wed, 28 Jan 2026 23:09:21 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	x86@...nel.org
Cc: Jinchao Wang <wangjinchao600@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Ian Rogers <irogers@...gle.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: [PATCH v6 02/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Add CONFIG_HAVE_POST_BREAKPOINT_HOOK which indicates the hw_breakpoint
on that architecture fires after the target memory has been modified.
This is currently x86 only behavior.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 arch/Kconfig         |   10 ++++++++++
 arch/x86/Kconfig     |    1 +
 kernel/trace/Kconfig |    1 +
 3 files changed, 12 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 31220f512b16..64adda21c5f6 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -453,6 +453,16 @@ config HAVE_MIXED_BREAKPOINTS_REGS
 	  Select this option if your arch implements breakpoints under the
 	  latter fashion.
 
+config HAVE_POST_BREAKPOINT_HOOK
+	bool
+	depends on HAVE_HW_BREAKPOINT
+	help
+	  Depending on the arch implementation of hardware breakpoints,
+	  some of them provide breakpoint hook after the target memory
+	  is modified.
+	  Select this option if your arch implements breakpoints overflow
+	  handler hooks after the target memory is modified.
+
 config HAVE_USER_RETURN_NOTIFIER
 	bool
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 80527299f859..755fd3bd4334 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -246,6 +246,7 @@ config X86
 	select HAVE_FUNCTION_TRACER
 	select HAVE_GCC_PLUGINS
 	select HAVE_HW_BREAKPOINT
+	select HAVE_POST_BREAKPOINT_HOOK
 	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_EXIT_ON_IRQ_STACK	if X86_64
 	select HAVE_IRQ_TIME_ACCOUNTING
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e09494c09cd5..087a27b56eb1 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -851,6 +851,7 @@ config WPROBE_EVENTS
 	bool "Enable wprobe-based dynamic events"
 	depends on TRACING
 	depends on HAVE_HW_BREAKPOINT
+	depends on HAVE_POST_BREAKPOINT_HOOK
 	select PROBE_EVENTS
 	select DYNAMIC_EVENTS
 	help