From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38F14C433EF for ; Thu, 20 Jan 2022 02:08:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BDB8C6B009D; Wed, 19 Jan 2022 21:08:44 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B8B656B009E; Wed, 19 Jan 2022 21:08:44 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A557B6B009F; Wed, 19 Jan 2022 21:08:44 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0125.hostedemail.com [216.40.44.125]) by kanga.kvack.org (Postfix) with ESMTP id 94E846B009D for ; Wed, 19 Jan 2022 21:08:44 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 5E9E618087357 for ; Thu, 20 Jan 2022 02:08:44 +0000 (UTC) X-FDA: 79049031768.09.C0D0CB3 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf23.hostedemail.com (Postfix) with ESMTP id D1197140028 for ; Thu, 20 Jan 2022 02:08:43 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A24D4B81C96; Thu, 20 Jan 2022 02:08:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C4F59C004E1; Thu, 20 Jan 2022 02:08:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1642644521; bh=Z9huB5XFFpA6qnJjzCHNjvXXEguu4cL9VWWXsfmRC5s=; h=Date:From:To:Subject:In-Reply-To:From; b=HFrqKIrNSpyuNjvhWhFMD8B7gnYJiHyhWkk2QhKoQBHkvyu64ERaCQY5kq9MBTrUD ePVu0sWO/4uWy/rwdd8I9GboBHF4k45aDSsQ6qE6KOl5ZsBnajwlXxxWmOqRakVevb SmLGOzYFnDQRNRtFjjjN+yXgJIHNkmXhs210zD7Y= Date: Wed, 19 Jan 2022 18:08:40 -0800 From: Andrew Morton To: akpm@linux-foundation.org, alexei.starovoitov@gmail.com, andrii.nakryiko@gmail.com, andrii@kernel.org, arnaldo.melo@gmail.com, david@redhat.com, dennis.dalessandro@cornelisnetworks.com, keescook@chromium.org, laoar.shao@gmail.com, linux-mm@kvack.org, mathieu.desnoyers@efficios.com, mirq-linux@rere.qmqm.pl, mm-commits@vger.kernel.org, peterz@infradead.org, pmladek@suse.com, rostedt@goodmis.org, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk, willy@infradead.org Subject: [patch 18/55] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN Message-ID: <20220120020840.Ztiy8H2wZ%akpm@linux-foundation.org> In-Reply-To: <20220119180714.9e187ce100e4510de3cd9f7d@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Stat-Signature: pkkzxuo3hubk8usepogh3ufz1c6jnosp Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=HFrqKIrN; dmarc=none; spf=pass (imf23.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D1197140028 X-HE-Tag: 1642644523-314143 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Yafang Shao Subject: tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM_LEN As the sched:sched_switch tracepoint args are derived from the kernel, we'd better make it same with the kernel. So the macro TASK_COMM_LEN is converted to type enum, then all the BPF programs can get it through BTF. The BPF program which wants to use TASK_COMM_LEN should include the header vmlinux.h. Regarding the test_stacktrace_map and test_tracepoint, as the type defined in linux/bpf.h are also defined in vmlinux.h, so we don't need to include linux/bpf.h again. Link: https://lkml.kernel.org/r/20211120112738.45980-8-laoar.shao@gmail.com Signed-off-by: Yafang Shao Acked-by: Andrii Nakryiko Acked-by: David Hildenbrand Cc: Mathieu Desnoyers Cc: Arnaldo Carvalho de Melo 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 Cc: Alexei Starovoitov Cc: Dennis Dalessandro Signed-off-by: Andrew Morton --- include/linux/sched.h | 9 +++++++-- tools/testing/selftests/bpf/progs/test_stacktrace_map.c | 6 +++--- tools/testing/selftests/bpf/progs/test_tracepoint.c | 6 +++--- 3 files changed, 13 insertions(+), 8 deletions(-) --- a/include/linux/sched.h~tools-testing-selftests-bpf-replace-open-coded-16-with-task_comm_len +++ a/include/linux/sched.h @@ -274,8 +274,13 @@ struct task_group; #define get_current_state() READ_ONCE(current->__state) -/* Task command name length: */ -#define TASK_COMM_LEN 16 +/* + * Define the task command name length as enum, then it can be visible to + * BPF programs. + */ +enum { + TASK_COMM_LEN = 16, +}; extern void scheduler_tick(void); --- a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c~tools-testing-selftests-bpf-replace-open-coded-16-with-task_comm_len +++ a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2018 Facebook -#include +#include #include #ifndef PERF_MAX_STACK_DEPTH @@ -41,11 +41,11 @@ struct { /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */ struct sched_switch_args { unsigned long long pad; - char prev_comm[16]; + char prev_comm[TASK_COMM_LEN]; int prev_pid; int prev_prio; long long prev_state; - char next_comm[16]; + char next_comm[TASK_COMM_LEN]; int next_pid; int next_prio; }; --- a/tools/testing/selftests/bpf/progs/test_tracepoint.c~tools-testing-selftests-bpf-replace-open-coded-16-with-task_comm_len +++ a/tools/testing/selftests/bpf/progs/test_tracepoint.c @@ -1,17 +1,17 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2017 Facebook -#include +#include #include /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */ struct sched_switch_args { unsigned long long pad; - char prev_comm[16]; + char prev_comm[TASK_COMM_LEN]; int prev_pid; int prev_prio; long long prev_state; - char next_comm[16]; + char next_comm[TASK_COMM_LEN]; int next_pid; int next_prio; }; _