Release 4.17 lib/dump_stack.c
// SPDX-License-Identifier: GPL-2.0
/*
* Provide a default dump_stack() function for architectures
* which don't implement their own.
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/smp.h>
#include <linux/atomic.h>
#include <linux/kexec.h>
#include <linux/utsname.h>
static char dump_stack_arch_desc_str[128];
/**
* dump_stack_set_arch_desc - set arch-specific str to show with task dumps
* @fmt: printf-style format string
* @...: arguments for the format string
*
* The configured string will be printed right after utsname during task
* dumps. Usually used to add arch-specific system identifiers. If an
* arch wants to make use of such an ID string, it should initialize this
* as soon as possible during boot.
*/
void __init dump_stack_set_arch_desc(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vsnprintf(dump_stack_arch_desc_str, sizeof(dump_stack_arch_desc_str),
fmt, args);
va_end(args);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Young | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
/**
* dump_stack_print_info - print generic debug info for dump_stack()
* @log_lvl: log level
*
* Arch-specific dump_stack() implementations can use this function to
* print out the same debug information as the generic dump_stack().
*/
void dump_stack_print_info(const char *log_lvl)
{
printk("%sCPU: %d PID: %d Comm: %.20s %s%s %s %.*s\n",
log_lvl, raw_smp_processor_id(), current->pid, current->comm,
kexec_crash_loaded() ? "Kdump: loaded " : "",
print_tainted(),
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
if (dump_stack_arch_desc_str[0] != '\0')
printk("%sHardware name: %s\n",
log_lvl, dump_stack_arch_desc_str);
print_worker_info(log_lvl, current);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Young | 86 | 100.00% | 1 | 100.00% |
| Total | 86 | 100.00% | 1 | 100.00% |
/**
* show_regs_print_info - print generic debug info for show_regs()
* @log_lvl: log level
*
* show_regs() implementations can use this function to print out generic
* debug information.
*/
void show_regs_print_info(const char *log_lvl)
{
dump_stack_print_info(log_lvl);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Young | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
static void __dump_stack(void)
{
dump_stack_print_info(KERN_DEFAULT);
show_stack(NULL, NULL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Morton | 9 | 45.00% | 1 | 33.33% |
| Tejun Heo | 9 | 45.00% | 1 | 33.33% |
| Alex Thorlton | 2 | 10.00% | 1 | 33.33% |
| Total | 20 | 100.00% | 3 | 100.00% |
/**
* dump_stack - dump the current task information and its stack trace
*
* Architectures can override this implementation by implementing its own.
*/
#ifdef CONFIG_SMP
static atomic_t dump_lock = ATOMIC_INIT(-1);
asmlinkage __visible void dump_stack(void)
{
unsigned long flags;
int was_locked;
int old;
int cpu;
/*
* Permit this cpu to perform nested stack dumps while serialising
* against other CPUs
*/
retry:
local_irq_save(flags);
cpu = smp_processor_id();
old = atomic_cmpxchg(&dump_lock, -1, cpu);
if (old == -1) {
was_locked = 0;
} else if (old == cpu) {
was_locked = 1;
} else {
local_irq_restore(flags);
cpu_relax();
goto retry;
}
__dump_stack();
if (!was_locked)
atomic_set(&dump_lock, -1);
local_irq_restore(flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Thorlton | 90 | 81.82% | 1 | 25.00% |
| Eric Dumazet | 18 | 16.36% | 1 | 25.00% |
| Andi Kleen | 2 | 1.82% | 2 | 50.00% |
| Total | 110 | 100.00% | 4 | 100.00% |
#else
asmlinkage __visible void dump_stack(void)
{
__dump_stack();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Thorlton | 10 | 83.33% | 1 | 33.33% |
| Andi Kleen | 2 | 16.67% | 2 | 66.67% |
| Total | 12 | 100.00% | 3 | 100.00% |
#endif
EXPORT_SYMBOL(dump_stack);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Young | 159 | 46.22% | 1 | 9.09% |
| Alex Thorlton | 126 | 36.63% | 1 | 9.09% |
| Eric Dumazet | 18 | 5.23% | 1 | 9.09% |
| Andrew Morton | 15 | 4.36% | 1 | 9.09% |
| Tejun Heo | 12 | 3.49% | 1 | 9.09% |
| Arnaldo Carvalho de Melo | 5 | 1.45% | 1 | 9.09% |
| Andi Kleen | 4 | 1.16% | 2 | 18.18% |
| Ingo Molnar | 3 | 0.87% | 1 | 9.09% |
| Greg Kroah-Hartman | 1 | 0.29% | 1 | 9.09% |
| Paul Gortmaker | 1 | 0.29% | 1 | 9.09% |
| Total | 344 | 100.00% | 11 | 100.00% |
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