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Message-ID: <20080102200852.GA7944@c2.user-mode-linux.org>
Date: Wed, 2 Jan 2008 15:08:52 -0500
From: Jeff Dike <jdike@...toit.com>
To: Andrew Morton <akpm@...l.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 2/7] UML - Remove current_thread
Tidy current-related stuff. There was a comment in current.h saying
that current_thread was obsolete, so this patch turns all instances of
current_thread into current_thread_info(). There's some simplifying
of the result in arch/um/sys-i386/signal.c.
current.h and thread_info.h also get style cleanups.
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
---
arch/um/kernel/process.c | 8 ++++----
arch/um/sys-i386/signal.c | 18 ++++++++----------
arch/um/sys-x86_64/signal.c | 4 ++--
include/asm-um/current.h | 23 ++---------------------
include/asm-um/thread_info.h | 8 ++++----
5 files changed, 20 insertions(+), 41 deletions(-)
Index: linux-2.6/arch/um/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/um/kernel/process.c 2007-11-20 11:28:00.000000000 -0500
+++ linux-2.6/arch/um/kernel/process.c 2007-11-20 11:54:11.000000000 -0500
@@ -251,7 +251,7 @@ void default_idle(void)
void cpu_idle(void)
{
- cpu_tasks[current_thread->cpu].pid = os_getpid();
+ cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
default_idle();
}
@@ -269,7 +269,7 @@ int user_context(unsigned long sp)
unsigned long stack;
stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
- return stack != (unsigned long) current_thread;
+ return stack != (unsigned long) current_thread_info();
}
extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
@@ -311,7 +311,7 @@ int strlen_user_proc(char __user *str)
int smp_sigio_handler(void)
{
#ifdef CONFIG_SMP
- int cpu = current_thread->cpu;
+ int cpu = current_thread_info()->cpu;
IPI_handler(cpu);
if (cpu != 0)
return 1;
@@ -321,7 +321,7 @@ int smp_sigio_handler(void)
int cpu(void)
{
- return current_thread->cpu;
+ return current_thread_info()->cpu;
}
static atomic_t using_sysemu = ATOMIC_INIT(0);
Index: linux-2.6/arch/um/sys-i386/signal.c
===================================================================
--- linux-2.6.orig/arch/um/sys-i386/signal.c 2007-11-20 11:22:34.000000000 -0500
+++ linux-2.6/arch/um/sys-i386/signal.c 2007-11-20 11:54:11.000000000 -0500
@@ -168,12 +168,13 @@ static int copy_sc_from_user(struct pt_r
struct sigcontext __user *from)
{
struct sigcontext sc;
- int err;
+ int err, pid;
err = copy_from_user(&sc, from, sizeof(sc));
if (err)
return err;
+ pid = userspace_pid[current_thread_info()->cpu];
copy_sc(®s->regs, &sc);
if (have_fpx_regs) {
struct user_fxsr_struct fpx;
@@ -187,8 +188,7 @@ static int copy_sc_from_user(struct pt_r
if (err)
return 1;
- err = restore_fpx_registers(userspace_pid[current_thread->cpu],
- (unsigned long *) &fpx);
+ err = restore_fpx_registers(pid, (unsigned long *) &fpx);
if (err < 0) {
printk(KERN_ERR "copy_sc_from_user - "
"restore_fpx_registers failed, errno = %d\n",
@@ -204,8 +204,7 @@ static int copy_sc_from_user(struct pt_r
if (err)
return 1;
- err = restore_fp_registers(userspace_pid[current_thread->cpu],
- (unsigned long *) &fp);
+ err = restore_fp_registers(pid, (unsigned long *) &fp);
if (err < 0) {
printk(KERN_ERR "copy_sc_from_user - "
"restore_fp_registers failed, errno = %d\n",
@@ -223,7 +222,7 @@ static int copy_sc_to_user(struct sigcon
{
struct sigcontext sc;
struct faultinfo * fi = ¤t->thread.arch.faultinfo;
- int err;
+ int err, pid;
sc.gs = REGS_GS(regs->regs.gp);
sc.fs = REGS_FS(regs->regs.gp);
@@ -249,11 +248,11 @@ static int copy_sc_to_user(struct sigcon
to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1));
sc.fpstate = to_fp;
+ pid = userspace_pid[current_thread_info()->cpu];
if (have_fpx_regs) {
struct user_fxsr_struct fpx;
- err = save_fpx_registers(userspace_pid[current_thread->cpu],
- (unsigned long *) &fpx);
+ err = save_fpx_registers(pid, (unsigned long *) &fpx);
if (err < 0){
printk(KERN_ERR "copy_sc_to_user - save_fpx_registers "
"failed, errno = %d\n", err);
@@ -276,8 +275,7 @@ static int copy_sc_to_user(struct sigcon
else {
struct user_i387_struct fp;
- err = save_fp_registers(userspace_pid[current_thread->cpu],
- (unsigned long *) &fp);
+ err = save_fp_registers(pid, (unsigned long *) &fp);
if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
return 1;
}
Index: linux-2.6/arch/um/sys-x86_64/signal.c
===================================================================
--- linux-2.6.orig/arch/um/sys-x86_64/signal.c 2007-11-20 11:22:34.000000000 -0500
+++ linux-2.6/arch/um/sys-x86_64/signal.c 2007-11-20 11:54:11.000000000 -0500
@@ -81,7 +81,7 @@ static int copy_sc_from_user(struct pt_r
if (err)
return 1;
- err = restore_fp_registers(userspace_pid[current_thread->cpu],
+ err = restore_fp_registers(userspace_pid[current_thread_info()->cpu],
(unsigned long *) &fp);
if (err < 0) {
printk(KERN_ERR "copy_sc_from_user - "
@@ -143,7 +143,7 @@ static int copy_sc_to_user(struct sigcon
if (err)
return 1;
- err = save_fp_registers(userspace_pid[current_thread->cpu],
+ err = save_fp_registers(userspace_pid[current_thread_info()->cpu],
(unsigned long *) &fp);
if (err < 0) {
printk(KERN_ERR "copy_sc_from_user - restore_fp_registers "
Index: linux-2.6/include/asm-um/current.h
===================================================================
--- linux-2.6.orig/include/asm-um/current.h 2007-11-20 11:22:34.000000000 -0500
+++ linux-2.6/include/asm-um/current.h 2007-11-20 11:54:11.000000000 -0500
@@ -1,32 +1,13 @@
-/*
- * Copyright (C) 2000 Jeff Dike (jdike@...aya.com)
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@...dtoit,linux.intel}.com)
* Licensed under the GPL
*/
#ifndef __UM_CURRENT_H
#define __UM_CURRENT_H
-#ifndef __ASSEMBLY__
-
-#include "asm/page.h"
#include "linux/thread_info.h"
#define current (current_thread_info()->task)
-/*Backward compatibility - it's used inside arch/um.*/
-#define current_thread current_thread_info()
-
-#endif /* __ASSEMBLY__ */
-
#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
Index: linux-2.6/include/asm-um/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-um/thread_info.h 2007-11-20 11:28:00.000000000 -0500
+++ linux-2.6/include/asm-um/thread_info.h 2007-11-20 11:54:11.000000000 -0500
@@ -1,5 +1,5 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@...aya.com)
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@...dtoit,linux.intel}.com)
* Licensed under the GPL
*/
@@ -76,8 +76,8 @@ static inline struct thread_info *curren
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
-#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
- * TIF_NEED_RESCHED
+#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
+ * TIF_NEED_RESCHED
*/
#define TIF_RESTART_BLOCK 4
#define TIF_MEMDIE 5
--
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