mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.2 KiB
133 lines
3.2 KiB
// 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> |
|
#include <linux/stop_machine.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); |
|
} |
|
|
|
/** |
|
* 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); |
|
print_stop_info(log_lvl, current); |
|
} |
|
|
|
/** |
|
* 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); |
|
} |
|
|
|
static void __dump_stack(void) |
|
{ |
|
dump_stack_print_info(KERN_DEFAULT); |
|
show_stack(NULL, NULL, KERN_DEFAULT); |
|
} |
|
|
|
/** |
|
* 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); |
|
/* |
|
* Wait for the lock to release before jumping to |
|
* atomic_cmpxchg() in order to mitigate the thundering herd |
|
* problem. |
|
*/ |
|
do { cpu_relax(); } while (atomic_read(&dump_lock) != -1); |
|
goto retry; |
|
} |
|
|
|
__dump_stack(); |
|
|
|
if (!was_locked) |
|
atomic_set(&dump_lock, -1); |
|
|
|
local_irq_restore(flags); |
|
} |
|
#else |
|
asmlinkage __visible void dump_stack(void) |
|
{ |
|
__dump_stack(); |
|
} |
|
#endif |
|
EXPORT_SYMBOL(dump_stack);
|
|
|