mirror of
https://github.com/torvalds/linux.git
synced 2025-11-01 00:58:39 +02:00
9a92a6ce6f
Current stacktrace only have the function for console output. page_owner that will be introduced in following patch needs to print the output of stacktrace into the buffer for our own output format so so new function, snprint_stack_trace(), is needed. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Dave Hansen <dave@sr71.net> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Jungsoo Son <jungsoo.son@lge.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/*
|
|
* kernel/stacktrace.c
|
|
*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/stacktrace.h>
|
|
|
|
void print_stack_trace(struct stack_trace *trace, int spaces)
|
|
{
|
|
int i;
|
|
|
|
if (WARN_ON(!trace->entries))
|
|
return;
|
|
|
|
for (i = 0; i < trace->nr_entries; i++) {
|
|
printk("%*c", 1 + spaces, ' ');
|
|
print_ip_sym(trace->entries[i]);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(print_stack_trace);
|
|
|
|
int snprint_stack_trace(char *buf, size_t size,
|
|
struct stack_trace *trace, int spaces)
|
|
{
|
|
int i;
|
|
unsigned long ip;
|
|
int generated;
|
|
int total = 0;
|
|
|
|
if (WARN_ON(!trace->entries))
|
|
return 0;
|
|
|
|
for (i = 0; i < trace->nr_entries; i++) {
|
|
ip = trace->entries[i];
|
|
generated = snprintf(buf, size, "%*c[<%p>] %pS\n",
|
|
1 + spaces, ' ', (void *) ip, (void *) ip);
|
|
|
|
total += generated;
|
|
|
|
/* Assume that generated isn't a negative number */
|
|
if (generated >= size) {
|
|
buf += size;
|
|
size = 0;
|
|
} else {
|
|
buf += generated;
|
|
size -= generated;
|
|
}
|
|
}
|
|
|
|
return total;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snprint_stack_trace);
|
|
|
|
/*
|
|
* Architectures that do not implement save_stack_trace_tsk or
|
|
* save_stack_trace_regs get this weak alias and a once-per-bootup warning
|
|
* (whenever this facility is utilized - for example by procfs):
|
|
*/
|
|
__weak void
|
|
save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
|
|
}
|
|
|
|
__weak void
|
|
save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
|
|
{
|
|
WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
|
|
}
|