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 7521A3203B6; Sun, 2 Aug 2026 08:19:28 +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=1785658769; cv=none; b=ctW52vyv0lWQemkUjLnvcOPhFHMxAnHoV9UkgOtwwCzJuv050/qMQAq/imp2AVJW2NB9TyAG7dbdiEIKwYu+5003L8RVvpMuopnaTRoEdS46tA4rF/lBezSNhW6t7UfHquE7D9nszVtntcHjsU7DAn575ggucSAqerp6S17My6Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785658769; c=relaxed/simple; bh=UQmY+k5YWaVCDo6SuSbSCaeodphPvgVFa1uiBOXOPKY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qO/nP753mSa1l6OzgVcEwMvPSYsbWbZoFMGl4POAAM2/FwiCJ9x8dd7xt3/5SWWKfYB/ORx8LaCf9tkEAKQnRO0GKSaOUOWWba7VV/wNJt5A6UBL8B1GE6tm5AFF/y7TNiAA1lI8KA23d6dJLn2XRIWwfkp+h4FJD7MKxwpDP0g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ACvC+9n5; 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="ACvC+9n5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1F6F1F00AC4; Sun, 2 Aug 2026 08:19:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785658768; bh=VYR+OU0Dn6REQfZ5dvoGwVChYT/u8V3bDeY73u8gbsw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ACvC+9n5sk8DHF20N/JBIruSI2uqq/fFYt06ja7qDVNThy1iH99x545S/3tz3hHXM ImZ1mzdTaj54i0RmgElNjlXdX2NoWp1Gvih+/Pzw2hZmCbPZirpCnvbszswnIgpx8e o2NiMBc7yuN4S1OXbKXGoQF9cR0G7X6CL/gUPKju+aq9nMxCBysBGba0+SkkRNl46V 8ONettXzp8aKCZ9EhHkvcWeP6mxZkx1aLSU16QgTs38cO49Wt1Zgw7Y6q+Yu1JCvTD NPHfYDCAuhbg5KoBuJ1GD8UmVAEA6VfA1l5OKA9KAzuiq/EYuL+1EO2SWV9uloSfmA +9tHs8a5kqrrA== 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 v11 05/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires Date: Sun, 2 Aug 2026 17:19:22 +0900 Message-ID: <178565876265.714490.13777267086485733929.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178565870538.714490.11309825813968306287.stgit@devnote2> References: <178565870538.714490.11309825813968306287.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@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