From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04B49471252; Fri, 7 Aug 2026 15:34:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116861; cv=none; b=V/4qhnbZcE5dQHiP9aHqNc9cD+YJ72iKM6zvWwef8CpWU1f5FsM0X7jUWUD3M4cHShdyWxIwtOxaMBYRLqjHL1m1Fpbs9LV7FZLa/9LElZVst6fftWbiED63kMYii85FXhnnewZT9x0cCjZAd6XFJCz458EnbjKezuJGCoQtwkc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116861; c=relaxed/simple; bh=UQmY+k5YWaVCDo6SuSbSCaeodphPvgVFa1uiBOXOPKY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Ub2kjju/lj4QSGr3LxR4rw1CnayOx8tI5UnkszRsBtI6caIxOcYq6cWil37G00HzxvKXqeZnMRTtVomGu5Hjk33tYtXrzvZW+soU1fW1fUSZ5FSFS74NvfmnoUjDdZgk8fhBQXi/AsdHrKX3GLPTRx5MQI0ktHLj5RFwW1t+3kc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QL53oSPt; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QL53oSPt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 163281F000E9; Fri, 7 Aug 2026 15:34:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786116859; bh=VYR+OU0Dn6REQfZ5dvoGwVChYT/u8V3bDeY73u8gbsw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QL53oSPtxyJV6cmSuhb+QviHLD8eaX+FboF92vWyRovTdzumw/S4dXN0UdWuSe73e +Ivt58sB9HeTm2XzI08+YYnNLyvtIHSxhwR3n84WCmXFOb4l8lcnjkc3GMVEIjpomw F2/rGI3XgeuqtzjMaGt1M9Vpqm4q9RCQCnZmdUV65G8piKu0J+WrxGf6+0VSwguiTx qnrhYdhSQNZhI53/h9PGX9T76QYw0ye/mV1LNr/brWIMTvVMS1HaU8jEZyQv6kI5jX bhO6Qbdc7iJhdvZtVh1WSedKgfFlNiwKpTi17WYJfOnGgEEzsGsgSA42J2uv2Lcm0e IoNob7KYyRghg== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra , Ingo Molnar , x86@kernel.org Cc: Jinchao Wang , Mathieu Desnoyers , Masami Hiramatsu , Thomas Gleixner , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Alexander Shishkin , Ian Rogers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH v12 05/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires Date: Sat, 8 Aug 2026 00:34:14 +0900 Message-ID: <178611685388.237811.14452013458905879452.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178611679753.237811.10190793347982785419.stgit@devnote2> References: <178611679753.237811.10190793347982785419.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) 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) --- 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