Eric Lee / linux-smarc-t335x-v3.2

Download as
Browse Code ยป

Commit 9212ddb5eada64fec5a08b28207401f3cc3d0876

Authored by Ingo Molnar
1 parent 4a6908a3a0
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

stacktrace: provide save_stack_trace_tsk() weak alias 

Impact: build fix

Some architectures have not implemented save_stack_trace_tsk() yet:

  fs/built-in.o: In function `proc_pid_stack':
  base.c:(.text+0x3f140): undefined reference to `save_stack_trace_tsk'

So warn about that if the facility is used.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

Showing 1 changed file with 11 additions and 0 deletions Inline Diff

1 /* 1 /*
2 * kernel/stacktrace.c 2 * kernel/stacktrace.c
3 * 3 *
4 * Stack trace management functions 4 * Stack trace management functions
5 * 5 *
6 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 6 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
7 */ 7 */
8 #include <linux/sched.h> 8 #include <linux/sched.h>
9 #include <linux/kernel.h>
9 #include <linux/module.h> 10 #include <linux/module.h>
10 #include <linux/kallsyms.h> 11 #include <linux/kallsyms.h>
11 #include <linux/stacktrace.h> 12 #include <linux/stacktrace.h>
12 13
13 void print_stack_trace(struct stack_trace *trace, int spaces) 14 void print_stack_trace(struct stack_trace *trace, int spaces)
14 { 15 {
15 int i; 16 int i;
16 17
17 if (WARN_ON(!trace->entries)) 18 if (WARN_ON(!trace->entries))
18 return; 19 return;
19 20
20 for (i = 0; i < trace->nr_entries; i++) { 21 for (i = 0; i < trace->nr_entries; i++) {
21 printk("%*c", 1 + spaces, ' '); 22 printk("%*c", 1 + spaces, ' ');
22 print_ip_sym(trace->entries[i]); 23 print_ip_sym(trace->entries[i]);
23 } 24 }
24 } 25 }
25 EXPORT_SYMBOL_GPL(print_stack_trace); 26 EXPORT_SYMBOL_GPL(print_stack_trace);
27
28 /*
29 * Architectures that do not implement save_stack_trace_tsk get this
30 * weak alias and a once-per-bootup warning (whenever this facility
31 * is utilized - for example by procfs):
32 */
33 __weak void
34 save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
35 {
36 WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
37 }
26 38