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printk: move dump stack related code to lib/dump_stack.c

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dump_stack related stuff should belong to lib/dump_stack.c thus move them
there. Also conditionally compile lib/dump_stack.c since dump_stack code
does not make sense if printk is disabled.

Link: http://lkml.kernel.org/r/20180213072834.GA24784@dhcp-128-65.nay.redhat.com
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org
Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Dave Young <dyoung@redhat.com>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Suggested-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Dave Young 2018-02-13 15:28:34 +08:00 committed by Petr Mladek
parent 097114aa6e
commit e36df28f53
4 changed files with 67 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/printk.h
View File

@ -201,6 +201,7 @@ void __init setup_log_buf(int early);
__printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
void dump_stack_print_info(const char *log_lvl);
void show_regs_print_info(const char *log_lvl);
extern asmlinkage void dump_stack(void) __cold;
extern void printk_safe_init(void);
extern void printk_safe_flush(void);
extern void printk_safe_flush_on_panic(void);
@ -264,6 +265,10 @@ static inline void show_regs_print_info(const char *log_lvl)
{
}
static inline asmlinkage void dump_stack(void)
{
}
static inline void printk_safe_init(void)
{
}
@ -279,8 +284,6 @@ static inline void printk_safe_flush_on_panic(void)
extern int kptr_restrict;
extern asmlinkage void dump_stack(void) __cold;
#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif

60
kernel/printk/printk.c
View File

@ -42,13 +42,11 @@
#include <linux/rculist.h>
#include <linux/poll.h>
#include <linux/irq_work.h>
#include <linux/utsname.h>
#include <linux/ctype.h>
#include <linux/uio.h>
#include <linux/sched/clock.h>
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
#include <linux/kexec.h>
#include <linux/uaccess.h>
#include <asm/sections.h>
@ -3257,62 +3255,4 @@ void kmsg_dump_rewind(struct kmsg_dumper *dumper)
}
EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
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);
}
/**
* 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);
}
#endif

3
lib/Makefile
View File

@ -18,7 +18,7 @@ KCOV_INSTRUMENT_debugobjects.o := n
KCOV_INSTRUMENT_dynamic_debug.o := n
lib-y := ctype.o string.o vsprintf.o cmdline.o \
rbtree.o radix-tree.o dump_stack.o timerqueue.o\
rbtree.o radix-tree.o timerqueue.o\
idr.o int_sqrt.o extable.o \
sha1.o chacha20.o irq_regs.o argv_split.o \
flex_proportions.o ratelimit.o show_mem.o \
@ -26,6 +26,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
earlycpio.o seq_buf.o siphash.o \
nmi_backtrace.o nodemask.o win_minmax.o
lib-$(CONFIG_PRINTK) += dump_stack.o
lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o
lib-$(CONFIG_DMA_DIRECT_OPS) += dma-direct.o

60
lib/dump_stack.c
View File

@ -10,6 +10,66 @@
#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);
}
/**
* 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);
}
/**
* 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)
{