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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132// 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/buildid.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);}
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)#define BUILD_ID_FMT " %20phN"#define BUILD_ID_VAL vmlinux_build_id#else#define BUILD_ID_FMT "%s"#define BUILD_ID_VAL ""#endif
/** * 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 UID: %u PID: %d Comm: %.20s %s%s %s %.*s %s " BUILD_ID_FMT "\n", log_lvl, raw_smp_processor_id(), __kuid_val(current_real_cred()->euid), current->pid, current->comm, kexec_crash_loaded() ? "Kdump: loaded " : "", print_tainted(), init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version, preempt_model_str(), BUILD_ID_VAL);
if (get_taint()) printk("%s%s\n", log_lvl, print_tainted_verbose());
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); print_scx_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(const char *log_lvl){ dump_stack_print_info(log_lvl); show_stack(NULL, NULL, log_lvl);}
/** * dump_stack_lvl - dump the current task information and its stack trace * @log_lvl: log level * * Architectures can override this implementation by implementing its own. */asmlinkage __visible void dump_stack_lvl(const char *log_lvl){ bool in_panic = panic_on_this_cpu(); unsigned long flags;
/* * Permit this cpu to perform nested stack dumps while serialising * against other CPUs, unless this CPU is in panic. * * When in panic, non-panic CPUs are not permitted to store new * printk messages so there is no need to synchronize the output. * This avoids potential deadlock in panic() if another CPU is * holding and unable to release the printk_cpu_sync. */ if (!in_panic) printk_cpu_sync_get_irqsave(flags);
__dump_stack(log_lvl);
if (!in_panic) printk_cpu_sync_put_irqrestore(flags);}EXPORT_SYMBOL(dump_stack_lvl);
asmlinkage __visible void dump_stack(void){ dump_stack_lvl(KERN_DEFAULT);}EXPORT_SYMBOL(dump_stack);