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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 19:53:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 19:53:30 -0700
commit357aa6aefebe888c712152cb83c9e700f98eebd1 (patch)
tree5adac02fbfd232e8df56563c3ab2facde669ba9c /lib
parentbe88751f320a716a4327596adfe834e162c14532 (diff)
parent47319f7186b8746521b0ee674054b29d7b35578b (diff)
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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
Diffstat (limited to 'lib')
-rw-r--r--lib/Makefile3
-rw-r--r--lib/dump_stack.c60
2 files changed, 62 insertions, 1 deletions
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)
{