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 X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B2B0C433E0 for ; Mon, 22 Jun 2020 23:46:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F38520738 for ; Mon, 22 Jun 2020 23:46:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731331AbgFVXqw (ORCPT ); Mon, 22 Jun 2020 19:46:52 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:54779 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730961AbgFVXqK (ORCPT ); Mon, 22 Jun 2020 19:46:10 -0400 Received: from ip5f5af08c.dynamic.kabel-deutschland.de ([95.90.240.140] helo=wittgenstein.fritz.box) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1jnW8e-0005DO-6Y; Mon, 22 Jun 2020 23:46:08 +0000 From: Christian Brauner To: linux-kernel@vger.kernel.org Cc: Linus Torvalds , Christian Brauner , Thomas Gleixner , Ingo Molnar , Al Viro , "Matthew Wilcox (Oracle)" , "Peter Zijlstra (Intel)" Subject: [PATCH 08/17] fork: remove do_fork() Date: Tue, 23 Jun 2020 01:43:17 +0200 Message-Id: <20200622234326.906346-9-christian.brauner@ubuntu.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200622234326.906346-1-christian.brauner@ubuntu.com> References: <20200622234326.906346-1-christian.brauner@ubuntu.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that all architectures have been switched to use _do_fork() and the new struct kernel_clone_args calling convention we can remove the legacy do_fork() helper completely. The calling convention used to be brittle and do_fork() didn't buy us anything. The only calling convention accepted should be based on struct kernel_clone_args going forward. It's cleaner and uniform. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Al Viro Cc: "Matthew Wilcox (Oracle)" Cc: "Peter Zijlstra (Intel)" Signed-off-by: Christian Brauner --- include/linux/sched/task.h | 1 - kernel/fork.c | 25 +------------------------ 2 files changed, 1 insertion(+), 25 deletions(-) diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index ddce0ea515d1..9f03c44941fb 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -96,7 +96,6 @@ extern void exit_files(struct task_struct *); extern void exit_itimers(struct signal_struct *); extern long _do_fork(struct kernel_clone_args *kargs); -extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); struct task_struct *fork_idle(int); struct mm_struct *copy_init_mm(void); extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); diff --git a/kernel/fork.c b/kernel/fork.c index 9875aeb2ba41..0fd7eb1b38f9 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2493,29 +2493,6 @@ long _do_fork(struct kernel_clone_args *args) return nr; } -#ifndef CONFIG_HAVE_COPY_THREAD_TLS -/* For compatibility with architectures that call do_fork directly rather than - * using the syscall entry points below. */ -long do_fork(unsigned long clone_flags, - unsigned long stack_start, - unsigned long stack_size, - int __user *parent_tidptr, - int __user *child_tidptr) -{ - struct kernel_clone_args args = { - .flags = (lower_32_bits(clone_flags) & ~CSIGNAL), - .pidfd = parent_tidptr, - .child_tid = child_tidptr, - .parent_tid = parent_tidptr, - .exit_signal = (lower_32_bits(clone_flags) & CSIGNAL), - .stack = stack_start, - .stack_size = stack_size, - }; - - return _do_fork(&args); -} -#endif - /* * Create a kernel thread. */ @@ -2923,7 +2900,7 @@ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp /* * unshare allows a process to 'unshare' part of the process * context which was originally shared using clone. copy_* - * functions used by do_fork() cannot be used here directly + * functions used by _do_fork() cannot be used here directly * because they modify an inactive task_struct that is being * constructed. Here we are modifying the current, active, * task_struct. -- 2.27.0