Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
time.c
Go to the documentation of this file.
1 /*
2  * Based on arch/arm/kernel/time.c
3  *
4  * Copyright (C) 1991, 1992, 1995 Linus Torvalds
5  * Modifications for ARM (C) 1994-2001 Russell King
6  * Copyright (C) 2012 ARM Ltd.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program. If not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #include <linux/export.h>
22 #include <linux/kernel.h>
23 #include <linux/interrupt.h>
24 #include <linux/time.h>
25 #include <linux/init.h>
26 #include <linux/sched.h>
27 #include <linux/smp.h>
28 #include <linux/timex.h>
29 #include <linux/errno.h>
30 #include <linux/profile.h>
31 #include <linux/syscore_ops.h>
32 #include <linux/timer.h>
33 #include <linux/irq.h>
34 
36 
37 #include <asm/thread_info.h>
38 #include <asm/stacktrace.h>
39 
40 #ifdef CONFIG_SMP
41 unsigned long profile_pc(struct pt_regs *regs)
42 {
43  struct stackframe frame;
44 
45  if (!in_lock_functions(regs->pc))
46  return regs->pc;
47 
48  frame.fp = regs->regs[29];
49  frame.sp = regs->sp;
50  frame.pc = regs->pc;
51  do {
52  int ret = unwind_frame(&frame);
53  if (ret < 0)
54  return 0;
55  } while (in_lock_functions(frame.pc));
56 
57  return frame.pc;
58 }
60 #endif
61 
62 void __init time_init(void)
63 {
65 }