Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

Pull printk updates from Petr Mladek:

 - Add info about loaded kdump kernel into the dump stack header

 - Move dump-stack related code from printk.c to lib/dump_stack.c

 - Write message about suspending consoles in KERN_INFO log level

* 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  printk: change message to pr_info
  printk: move dump stack related code to lib/dump_stack.c
  print kdump kernel loaded status in stack dump

4 files changed, 68 insertions, 61 deletions

diff --git a/include/linux/printk.h b/include/linux/printk.h
index e9b603ee9953..6d7e800affd8 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -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
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index f274fbef821d..704e55129c3a 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -42,7 +42,6 @@
 #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>
@@ -2162,7 +2161,7 @@ void suspend_console(void)
 {
         if (!console_suspend_enabled)
                 return;
-        printk("Suspending console(s) (use no_console_suspend to debug)\n");
+        pr_info("Suspending console(s) (use no_console_suspend to debug)\n");
         console_lock();
         console_suspended = 1;
         up_console_sem();
@@ -3257,60 +3256,4 @@ 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\n",
-               log_lvl, raw_smp_processor_id(), current->pid, current->comm,
-               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
diff --git a/lib/Makefile b/lib/Makefile
index a90d4fcd748f..0bd50d71f423 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -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
diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index c5edbedd364d..5cff72f18c4a 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -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)
 {