On 8/7/2026 11:34 PM, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <[email protected]>
>
> 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) <[email protected]>
> ---
> 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 <[email protected]>
