Re: [PATCH v12 05/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires

[Jinchao Wang]

On 8/7/2026 11:34 PM, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> 
> 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@xxxxxxxxxx>
> ---
>  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
> 
Reviewed-by: Jinchao Wang <wangjinchao600@xxxxxxxxx>