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 A11BB3F660F; Fri, 26 Jun 2026 14:14:21 +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=1782483262; cv=none; b=RoRPUbI+MV184mZcRN0KGu3wqPrld7W1OBxPXnP4nXzThMwyjKSlnv+gigZZFokDbJfXzlJp7R+bMo/x6kiFoX63TdYPaOzwNNzhDHSuaP38vfj6eMyBOnZ7wlgTD6GQqeLW8l+tiAR6cjI0tn7f5KXhzSbIXdaMwRPZkp17gEY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782483262; c=relaxed/simple; bh=6WeEfBZ8rG6m1SW6DnxtfbwfS0Mue6OQjmOfMXiosnc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=dAmUUwiCuv6eLeE+mk+FoQVvVtxwvXqOU+6RP/2FSsq95gpXplvcAPQwYNnnHvwDKeNdiN8U802zZ9wY/7BHtLGTlIvBl9bm6S5LvEKpsh5jPz4XjWl6aAxu/ZzI5cUB0GPGjJ7RPmgVy3QEN/ePBESLdSfFQLFUxNdOhNkpYKs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=foKHBDQm; 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="foKHBDQm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74BFF1F000E9; Fri, 26 Jun 2026 14:14:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782483261; bh=SkXzb6SusHWpjYbemZl565iVMWbnBwLhnpo+kzrmlw4=; h=From:To:Cc:Subject:Date; b=foKHBDQmRNlCmzzoAIYLPHl0igRL+acjd1AMpxjLShKlGKCBY1QIyO74CxQVQCZFA gGffgzKTGNwIOZpRL1SZ98FltmHAsF2gbcMZKnwNwLubleIBvH4rAEKxc/R3Xh/4z8 WngspWzQfdlHUZZP3CuGTDr8BEGm3EoghL2dxJyugBARLXWXu/bJnmzUa+UYJDDKB/ msSQX5bEA7Iz/EfsuOJYC3JJ09Cbh78JjFVyGyKA/hGKRPt3Yig0GcpJ+Fhy8Jawj6 dqd3nWR2Yk99Mi4xOOiylR4dS+ErgEgZ5yf3XFOcM3EyvlE5v32zs+4ZqUG6VRlu5n p7X/yh9k4JUmA== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Mathieu Desnoyers Cc: Jonathan Corbet , Shuah Khan , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v11 00/11] tracing/probes: Add more typecast features Date: Fri, 26 Jun 2026 23:14:16 +0900 Message-ID: <178248325671.841606.17344906774310339507.stgit@devnote2> X-Mailer: git-send-email 2.43.0 User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-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 Hi, Here is the 11th version of series to introduce more typecast features to probe events. The previous version is here: https://lore.kernel.org/all/178243982430.790911.17439694390021542101.stgit@devnote2/ In this version, I fixed minor issues and add 2 patches to fix in-tree tools to ignore comment lines in dynamic_events[3/11][4/11]. This series extends BTF typecast feature and add more options: 1. Expanding BTF typecast to kprobe and fprobe. (currently only function entry/exit) 2. Introduce container_of like typecast. This adds a "assigned member" option to the typecast. (STRUCT,MEMBER)VAR->ANOTHER_MEMBER This casts VAR to STRUCT type but the VAR is as the address of STRUCT.MEMBER. In C, it is: container_of(VAR, STRUCT, MEMBER)->ANOTHER_MEMBER 3. Support nested typecast, e.g. (STRUCT)((STRUCT2)VAR->MEMBER2)->MEMBER the nest level must be smaller than 3. 4. Add $current variable to point "current" task_struct. This is useful with typecast, e.g. (task_struct)$current->pid 5. per-cpu dereference support. Intrdouce this_cpu_read(VAR) and this_cpu_ptr(VAR) to access per-cpu data on the current CPU (accessing other CPU data is not stable, because it can be changed.) You can access the member of per-cpu data structure using typecast like: (STRUCT)this_cpu_ptr(VAR)->MEMBER 6. Support event fields without $ prefix on eprobes. Now eprobe events can access its event fields. And added fetcharg dump feature (for debug) and updated test scripts to test part of them. Thanks, --- base-commit: c69b5f959286395e94c237ce6d7d4970bad7f6e3 Masami Hiramatsu (Google) (11): tracing/probes: Allow eprobe to use variable without $ prefix tracing/probes: Support dumping fetcharg program for debugging dynamic events tools/bootconfig: Ignore comment lines in dynamic_events/kprobe_events file perf/probe: Ignore comment lines in dynamic_events/kprobe_events file tracing/probes: Support typecast for various probe events tracing/probes: Support nested typecast tracing/probes: Type casting always involves nested calls tracing/probes: Support field specifier option for typecast tracing/probes: Add $current variable support tracing/probes: Add this_cpu_read() and this_cpu_ptr() dereference method to fetcharg tracing/probes: Add a new testcase for BTF typecasts Documentation/trace/eprobetrace.rst | 7 Documentation/trace/fprobetrace.rst | 10 Documentation/trace/kprobetrace.rst | 11 kernel/trace/Kconfig | 12 kernel/trace/trace.c | 8 kernel/trace/trace_eprobe.c | 2 kernel/trace/trace_fprobe.c | 2 kernel/trace/trace_kprobe.c | 2 kernel/trace/trace_probe.c | 585 ++++++++++++++++---- kernel/trace/trace_probe.h | 100 ++- kernel/trace/trace_probe_tmpl.h | 25 + kernel/trace/trace_uprobe.c | 3 samples/trace_events/trace-events-sample.c | 40 + samples/trace_events/trace-events-sample.h | 34 + tools/bootconfig/scripts/ftrace2bconf.sh | 2 tools/perf/util/probe-file.c | 2 .../ftrace/test.d/dynevent/btf_probe_event.tc | 51 ++ .../test.d/dynevent/btf_typecast_accepted.tc | 107 ++++ .../test.d/dynevent/eprobes_syntax_errors.tc | 12 .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc | 12 .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc | 12 .../ftrace/test.d/kprobe/uprobe_syntax_errors.tc | 5 22 files changed, 890 insertions(+), 154 deletions(-) create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/btf_probe_event.tc create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/btf_typecast_accepted.tc -- Masami Hiramatsu (Google)