From patchwork Mon Nov 8 08:38:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 12608011 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1052FC4332F for ; Mon, 8 Nov 2021 08:39:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F0AEE6124D for ; Mon, 8 Nov 2021 08:39:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238072AbhKHImK (ORCPT ); Mon, 8 Nov 2021 03:42:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234965AbhKHImJ (ORCPT ); Mon, 8 Nov 2021 03:42:09 -0500 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A4992C061570; Mon, 8 Nov 2021 00:39:24 -0800 (PST) Received: by mail-pj1-x1036.google.com with SMTP id iq11so7576342pjb.3; Mon, 08 Nov 2021 00:39:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xlgz5f/1O7j1fYQGwZaGYM2sPo7uBwCryb9I1PFva10=; b=mu+nQO3yTipG+EFeCqkGRpcXAHGb/8gxmZo+EDH9ytABe13PJCvj7yg40gSQ6BtopL W9cd7aLMbBxdIqQBDagjm5iSOLlZY5z016L1Wv/9B4M9HPspxdxK3cSEeNdPyAvXHC+t sescGDiM5vgOCBS7t2DeIhrjjZ14RQft4d+NRhEok4L8unqGF8CcIcek+xBmrSsRjVN8 nVO3O2hheXB7EEmUUFvxj8JoJ/3FMtFdQaZfBpn/+hZmAIg1DMcsPC8f5Acm3rIaAQRS IiilGsYGP4yID21gz87Lttl9qljFoCNit3ACWlNxRWSR+Vi3ScaMIpQKr8HyhPtTG4T3 kTEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=xlgz5f/1O7j1fYQGwZaGYM2sPo7uBwCryb9I1PFva10=; b=5TBIXvMVrC7d/Fl+S8GFAgvCAhGRdOSJ4QMHVHdH+GdWxX1zw664VoLPmsRUV6GHUq Lmb42ZZLRln8gEddQoXRKAHDzEgVPW0w9tmlPkowfULXQRR/M/9b5eBsNInVytAQ2JpP MtsbV8vQ1eRClWLS2b1I25ARcUDgipmeVLKg0xp4i3AitZwJwv0qGkRomeHjaqCeqZir yUL9BPbQpD57T4rm6GyK4SMm32GvYnOyIYiHRUeMhGpNE2iFK3UElk0B80cAW1JaLlE9 k1FCJrvrDUgGBUvkBMLNbgE/feMXoL7zktO9qpzaWpuld/bihzBiXqGx9ABt8rBDvLI4 HDCw== X-Gm-Message-State: AOAM530Nwx1AF+dAqT72ftfzkZdXIqeEHT7OBXDpnGRTMTqmPNdOu7o+ ZlUI1I9vtsEKeLwHWvYt7dc= X-Google-Smtp-Source: ABdhPJy1+50gPKAmCT9Y0ZwuuPEAhduRynsf7+l9Q3TeWobNCHK2T8eiL59YlBTlGbJV4bZzZldAdA== X-Received: by 2002:a17:90a:5986:: with SMTP id l6mr50152993pji.215.1636360764275; Mon, 08 Nov 2021 00:39:24 -0800 (PST) Received: from localhost.localdomain ([45.63.124.202]) by smtp.gmail.com with ESMTPSA id w3sm12253206pfd.195.2021.11.08.00.39.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Nov 2021 00:39:23 -0800 (PST) From: Yafang Shao To: akpm@linux-foundation.org Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, oliver.sang@intel.com, lkp@intel.com, Yafang Shao , Mathieu Desnoyers , Arnaldo Carvalho de Melo , Alexei Starovoitov , Andrii Nakryiko , Michal Miroslaw , Peter Zijlstra , Steven Rostedt , Matthew Wilcox , David Hildenbrand , Al Viro , Kees Cook , Petr Mladek Subject: [PATCH 0/7] task comm cleanups Date: Mon, 8 Nov 2021 08:38:33 +0000 Message-Id: <20211108083840.4627-1-laoar.shao@gmail.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patchset is part of the patchset "extend task comm from 16 to 24"[1]. Now we have different opinion that dynamically allocates memory to store kthread's long name into a separate pointer, so I decide to take the useful cleanups apart from the original patchset and send it separately[2]. These useful cleanups can make the usage around task comm less error-prone. Furthermore, it will be useful if we want to extend task comm in the future. All of the patches except patch #4 have either a reviewed-by or a acked-by now. I have verfied that the vmcore/crash works well after patch #4. [1]. https://lore.kernel.org/lkml/20211101060419.4682-1-laoar.shao@gmail.com/ [2]. https://lore.kernel.org/lkml/CALOAHbAx55AUo3bm8ZepZSZnw7A08cvKPdPyNTf=E_tPqmw5hw@mail.gmail.com/ Cc: Mathieu Desnoyers Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Michal Miroslaw Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Matthew Wilcox Cc: David Hildenbrand Cc: Al Viro Cc: Kees Cook Cc: Petr Mladek Yafang Shao (7): fs/exec: make __set_task_comm always set a nul terminated string fs/exec: make __get_task_comm always get a nul terminated string drivers/infiniband: use get_task_comm instead of open-coded string copy fs/binfmt_elf: use get_task_comm instead of open-coded string copy samples/bpf/test_overhead_kprobe_kern: make it adopt to task comm size change tools/bpf/bpftool/skeleton: use bpf_probe_read_kernel_str to get task comm tools/testing/selftests/bpf: make it adopt to task comm size change drivers/infiniband/hw/qib/qib.h | 2 +- drivers/infiniband/hw/qib/qib_file_ops.c | 2 +- fs/binfmt_elf.c | 2 +- fs/exec.c | 5 +++-- include/linux/sched.h | 9 +++++++-- samples/bpf/offwaketime_kern.c | 4 ++-- samples/bpf/test_overhead_kprobe_kern.c | 11 ++++++----- samples/bpf/test_overhead_tp_kern.c | 5 +++-- tools/bpf/bpftool/skeleton/pid_iter.bpf.c | 4 ++-- .../testing/selftests/bpf/progs/test_stacktrace_map.c | 6 +++--- tools/testing/selftests/bpf/progs/test_tracepoint.c | 6 +++--- 11 files changed, 32 insertions(+), 24 deletions(-)