From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f43.google.com (mail-ej1-f43.google.com [209.85.218.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95A3540BCB7 for ; Mon, 17 Aug 2026 12:11:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786968673; cv=none; b=bEI1deQuGAufoGgICvIQJTa362GPb+dNCsBSwQkGeCaxXYgUqsjyrYuGcFM3TTwrhM2aTlsVGUhDe1CgLioxVrze4xHjJkL0WXvYaie1MSSRRCEPvXc18maO6V9v1WTelML7bqd3y7PcQoWmRV+AsOOjw7l5O28nFz/2WTMgs/s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786968673; c=relaxed/simple; bh=PJR0h7C/VzRo3uPH48UKQj4Yt6lbJ3zv05wBAo3oTHE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Amq9IYuWPCCfeucWnNCsqZ2xwZYfQ38VSGfo6nFi5VU/Y++TWeHhGBQB2mSIfO6tUeWCfxkwSZ+FsRdEPxHi5//hJJbjJYupEWU/WvFyRNxAnSZ0FzWN5s/6Ssvgw4X4VUjaKvuyNKD6JiRuxHI6qezaAjnjzIEvT+zioDrYCKI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ouCdA47w; arc=none smtp.client-ip=209.85.218.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ouCdA47w" Received: by mail-ej1-f43.google.com with SMTP id a640c23a62f3a-c15cd3fd760so399470566b.2 for ; Mon, 17 Aug 2026 05:11:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1786968670; x=1787573470; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to:content-type; bh=kYFZLTaPPfJf4QgXpghGqRg1zayFCFmSXU8y0/5uqUc=; b=ouCdA47wZCbOyPiFixwK740tpkeCjiKhH3/lj+cdw/T0LJQPhbYdxUO2zmWRd570Mb vy8iHyKZhjvKeLSqqXp45tO/YLHjpI5mRkPzGrPuLsgXpBfuX2Ed/Hmb/5LPkq8I5gHa m6AU9ZWJ+JEaaxcWSvzf21mxQ59XK2fg3yWKGsfE1qSEXhIGPG0Z9dAW8Sk3Ek45J8BR GYhrCUbt9CpP3p52679JQAlaluVPT0u3Y1pL5HdN7XzTekP/3kCIQH6Lr+MfOCSmyZnP kMQen4bPo7gWZwO3ZLvW5Kt0JmHsUX1UAkicJHqCN6hvnksZX1ZoKaohWfRlLQFSpyhp hrqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786968670; x=1787573470; h=content-transfer-encoding:content-type:in-reply-to:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=kYFZLTaPPfJf4QgXpghGqRg1zayFCFmSXU8y0/5uqUc=; b=ojg/W+AStEkyOmEaYSLGBNY1Zy3iAtVXG419dOVTqzisbk8p9UhQo1333WbFVSouU+ RHzSGp+sSycAuAPWoaCnni5JcYLlMrHVGvEJb0j6WTUKtp45svHP+83lNDYvXTQ5gu3x p5XaoNStqJJ5TUcfs/XtpFe4uGNdebNyiXgDu5sVyXRI5ASaZkz6jISNlEBs9MyNY94e jTmx1w5IjZJiJWKw0sQF55ybNLzEsV8725qrCpaPWuc37C9JobwAGq5hmvcMrGsZ/Ubk hhY6j9onwWwxVdPaIJJCKuN0X7mGufh5GeGV4oHz9PZimqW//09PMzZVbpsLIE371Pt1 dzWA== X-Forwarded-Encrypted: i=1; AHgh+RpS5x6NHZCCSkK/KIBp6txMCPfMl0NLgupSg0GznIbrwLMSUIs3I/gk6oyk57mRCk0RxvUhxcUcR+A=@vger.kernel.org X-Gm-Message-State: AOJu0YztcWVndUPKXroxzrcPPNJBYWKsv0GH6yR/9YDckTJIgDEksaZR 9FUMV/0tgesOEK2H4LjPG/53PXVYwsgH8WobO+D4FL1z6O+FeyzZChTx X-Gm-Gg: AR+sD12+u0Bv9V6jqfaU0Cq/vr39eqA2MQBTQYWXhJcSDNdbsk4qoqu18gXmZ6z4tvg 2f9VIx0BoJWIYnRIAcXAPz8s8fX+LJr3RJ29vMlGYYx7DnuArigu0pIkYuGeMNhjVeQuHXsZISi p6L3rwxB+b97dVO9DEY5rAO/Q4v6haDu5bS3W7JZ0VO+uLuhPMSIlWDw4i79i+FV15C6JH+mqNO LCc5t8n5MZl3y4ByYfUkzw0OaC20duaxBoqBLKAdaKoiCv7nfX4k9acwRMgiterU85NaxrQNDLw byU+3BcLr/ThWp7A2tGaIu8RTSRIqimV6ProTSz2B6GV8fL76TQvI9eW1pIt8NdEWw/IWJ34947 yDcsSixNB+1J27BCIVsQUvv5npxGeUUSm4Qp18fv/Cy02hywdsW2KxSwJECxSIXEnXzyuczTfmM zGiQhUkdCcYZWRQSfXjRghA0iKA0dDXZnZ+DbQoDzk3zvkT1a72Us66iW2yjVzgQ== X-Received: by 2002:a17:906:7950:b0:c12:764e:326 with SMTP id a640c23a62f3a-c212a385512mr1051411166b.27.1786968669702; Mon, 17 Aug 2026 05:11:09 -0700 (PDT) Received: from [127.0.0.1] ([144.24.58.22]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c217fe6aa89sm46476466b.2.2026.08.17.05.11.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Aug 2026 05:11:08 -0700 (PDT) Message-ID: Date: Mon, 17 Aug 2026 20:10:58 +0800 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 05/11] x86: hw_breakpoint: Add a kconfig to clarify when a breakpoint fires Content-Language: en-US To: "Masami Hiramatsu (Google)" , Steven Rostedt , Peter Zijlstra , Ingo Molnar , x86@kernel.org Cc: Mathieu Desnoyers , 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 References: <178611679753.237811.10190793347982785419.stgit@devnote2> <178611685388.237811.14452013458905879452.stgit@devnote2> From: Jinchao Wang In-Reply-To: <178611685388.237811.14452013458905879452.stgit@devnote2> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/7/2026 11:34 PM, Masami Hiramatsu (Google) wrote: > 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 > Reviewed-by: Jinchao Wang