[PATCH v11 05/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2026-08-02 08:19:28
Also in:
linux-doc, linux-perf-users, lkml
Subsystem:
the rest, tracing, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Masami Hiramatsu (Google) <mhiramat@kernel.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@kernel.org> --- Changes in v11: - Move select to alphabetically sorted place. --- 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 bea383408e32..a096952987a8 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig@@ -457,6 +457,16 @@ 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_MODIFY_LOCAL_HW_BREAKPOINT_ADDR bool depends on HAVE_HW_BREAKPOINT
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 33908103d9a0..533010ab29a9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig@@ -287,6 +287,7 @@ config X86 select MMU_GATHER_RCU_TABLE_FREE select MMU_GATHER_MERGE_VMAS select HAVE_POSIX_CPU_TIMERS_TASK_WORK + select HAVE_POST_BREAKPOINT_HOOK select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC || STACK_VALIDATION select HAVE_FUNCTION_ARG_ACCESS_API
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index b58c2565024f..d9b6fa5c35d9 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig@@ -866,6 +866,7 @@ 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