From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f53.google.com (mail-ej1-f53.google.com [209.85.218.53]) (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 940BB40BCA0 for ; Mon, 17 Aug 2026 12:11:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786968673; cv=none; b=Q3zDPBElZNEQX3jg2ICevwXWD3XJ7cHFgDAe0f9McvC+0QphZ4crBod5sKImWp+mlMZym4AP5LckudI/bXcjpr2kbKJlGTn6ABohT7i/ehXXVsgbzS0MbV1pAcRfHJm+l4Or80O1ac2R5fv9Qc5c91hI4t79HBtNxmObSPXh7Zk= 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=209.85.218.53 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-f53.google.com with SMTP id a640c23a62f3a-c15d111ca99so349982366b.0 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=AheuWYalTPAEEaNVoYoZ/wyRH+yzclJvUAq8cooC+GScT4SMrvXwDARaoz5djgkXCf ttfQADC1THQNRlANGNCoPVvrcMZgw1xnABir3GIsNjU6WmZdbFw/H6qaYUMlYhy9gQTe qhO4Sn26KKd0+dFuYtFf6TJhu18KAbtDBxsuah226aDSdpmRBASl0sK5vvZ7rkC4yThX rixrCUyFJ460lGXb4mun6Up+wVJuZ1D07rpn2K+w/3QNygM3rLVijJsyQz3QgGwY5V6X ENYVB/y2IUq70etlsAwY88TQoTLjcMWVnBaCL8I7p2PvfWKYb2cesgXILWm1Udxz5zZP 4GUA== X-Forwarded-Encrypted: i=1; AHgh+Rq+oj+yl7qu18PhwUHW9b0pFHoJopUtJHXEeSLkwI9MmM+vPIsk3OqvpH1bgoOJogC2raPfAMmMRVblvHTNGFQWQ6o=@vger.kernel.org X-Gm-Message-State: AOJu0YwWGYpZKbR45/zsqqyL9dUuSTIy7KRrkaGHOUy7ZohU58icIuzo D+J1jVze1S33wQdXpN9ISdhc/y0cpt4MV5G+rZ5JKQ/I+XaK2y7SYJsq X-Gm-Gg: AR+sD136YqnYYmem2X2aTWknV45pyTbuba9G3XpELKhviASxnUUxhDZlseo9Y04CKbc 9TG6ZSYQnKnfsEcYvnKg6/5axO9PrYPJ3WdFhnIi8d5YPQrdwUwtiUUCZEzx3CC8/qCSInLixaT a+7WqcScKhIlU4PAM8vOJzD+E4u11fy2r75Xt0Z0FOAhlTAwR+3hSAKaAgW0ltI93VfeqGWXTaE 1L1SDPphu2XynXIhn6TZGZ0xbZo7+72QuTxca6I5ylZpp5T/PAA6SXTLpi5SamYNzTSPXdIRuA6 q6em9t+D/BuEg2NFDCtaMcSej7PRpvqDijRGTDxA6Kl4yxQVnJNPu6nC3xR/NkA5i9i8L2PdoaM W4lqNKCUSU3ztNsDPaGMnJOEsxszkAvhHGp4QnwDk7BtzlXqAc3BkS8wLyo3kwsHL5c/xhARI2F xqWjA1kJAykvQRfkHBEiba2Q2PwkJhkG8QpW9bU8RMT61gUuq4pfNggFduZEOiCA== 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-trace-kernel@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