From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964832AbVHYFXg (ORCPT ); Thu, 25 Aug 2005 01:23:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964830AbVHYFW1 (ORCPT ); Thu, 25 Aug 2005 01:22:27 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:8908 "EHLO parcelfarce.linux.theplanet.co.uk") by vger.kernel.org with ESMTP id S964820AbVHYFWG (ORCPT ); Thu, 25 Aug 2005 01:22:06 -0400 To: geert@linux-m68k.org, torvalds@osdl.org Subject: [PATCH] (18/22) task_thread_info - part 2/4 Cc: linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org Message-Id: From: Al Viro Date: Thu, 25 Aug 2005 06:25:11 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org encapsulates the rest of arch-dependent operations with thread_info access. Two new helpers - setup_thread_info() and end_of_stack(). For normal case the former consists of copying thread_info of parent to new thread_info and the latter returns pointer immediately past the end of thread_info. Signed-off-by: Al Viro ---- diff -urN RC13-rc7-task_thread_info/include/linux/sched.h RC13-rc7-other-helpers/include/linux/sched.h --- RC13-rc7-task_thread_info/include/linux/sched.h 2005-08-25 00:54:17.000000000 -0400 +++ RC13-rc7-other-helpers/include/linux/sched.h 2005-08-25 00:54:17.000000000 -0400 @@ -1138,6 +1138,16 @@ #define task_thread_info(task) (task)->thread_info +static inline void setup_thread_info(struct task_struct *p, struct thread_info *ti) +{ + *ti = *p->thread_info; +} + +static inline unsigned long *end_of_stack(struct task_struct *p) +{ + return (unsigned long *)(p->thread_info + 1); +} + /* set thread flags in other task's structures * - see asm/thread_info.h for TIF_xxxx flags available */ diff -urN RC13-rc7-task_thread_info/kernel/fork.c RC13-rc7-other-helpers/kernel/fork.c --- RC13-rc7-task_thread_info/kernel/fork.c 2005-08-25 00:54:17.000000000 -0400 +++ RC13-rc7-other-helpers/kernel/fork.c 2005-08-25 00:54:17.000000000 -0400 @@ -169,8 +169,8 @@ return NULL; } - *ti = *orig->thread_info; *tsk = *orig; + setup_thread_info(tsk, ti); tsk->thread_info = ti; ti->task = tsk; diff -urN RC13-rc7-task_thread_info/kernel/sched.c RC13-rc7-other-helpers/kernel/sched.c --- RC13-rc7-task_thread_info/kernel/sched.c 2005-08-25 00:54:17.000000000 -0400 +++ RC13-rc7-other-helpers/kernel/sched.c 2005-08-25 00:54:17.000000000 -0400 @@ -4121,10 +4121,10 @@ #endif #ifdef CONFIG_DEBUG_STACK_USAGE { - unsigned long * n = (unsigned long *) (p->thread_info+1); + unsigned long * n = end_of_stack(p); while (!*n) n++; - free = (unsigned long) n - (unsigned long)(p->thread_info+1); + free = (unsigned long) n - (unsigned long) end_of_stack(p); } #endif printk("%5lu %5d %6d ", free, p->pid, p->parent->pid);