33 files changed, 32 insertions, 262 deletions
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 4037461a6493..affccb959a9e 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -169,13 +169,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        dik_show_trace(sp);
 }
-void dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 void
 die_if_kernel(char * str, struct pt_regs *regs, long err, unsigned long *r9_15)
 {
diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c
index a63ff842564b..ca0207b9d5b6 100644
--- a/arch/arc/kernel/stacktrace.c
+++ b/arch/arc/kernel/stacktrace.c
@@ -220,13 +220,6 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
        show_stacktrace(tsk, NULL);
 }
-/* Expected by Rest of kernel code */
-void dump_stack(void)
-{
-        show_stacktrace(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 /* Another API expected by schedular, shows up in "ps" as Wait Channel
 * Ofcourse just returning schedule( ) would be pointless so unwind until
 * the function is not in schedular code
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 1c089119b2d7..18b32e8e4497 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -204,13 +204,6 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
 }
 #endif
-void dump_stack(void)
-{
-        dump_backtrace(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 void show_stack(struct task_struct *tsk, unsigned long *sp)
 {
        dump_backtrace(NULL, tsk);
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index b3c5f628bdb4..61d7dd29f756 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -167,13 +167,6 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
        }
 }
-void dump_stack(void)
-{
-        dump_backtrace(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 void show_stack(struct task_struct *tsk, unsigned long *sp)
 {
        dump_backtrace(NULL, tsk);
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 073c3c2fa521..89a8017e8ca6 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -204,14 +204,6 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
        show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
 }
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_trace_log_lvl(current, &stack, NULL, "");
-}
-EXPORT_SYMBOL(dump_stack);
 static const char *cpu_modes[] = {
        "Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
        "Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
diff --git a/arch/blackfin/kernel/dumpstack.c b/arch/blackfin/kernel/dumpstack.c
index 5cfbaa298211..95ba6d9e9a3d 100644
--- a/arch/blackfin/kernel/dumpstack.c
+++ b/arch/blackfin/kernel/dumpstack.c
@@ -168,6 +168,7 @@ void dump_stack(void)
 #endif
        trace_buffer_save(tflags);
        dump_bfin_trace_buffer();
+        dump_stack_print_info(KERN_DEFAULT);
        show_stack(current, &stack);
        trace_buffer_restore(tflags);
 }
diff --git a/arch/c6x/kernel/traps.c b/arch/c6x/kernel/traps.c
index 1be74e5b4788..d0b96ef25c17 100644
--- a/arch/c6x/kernel/traps.c
+++ b/arch/c6x/kernel/traps.c
@@ -67,15 +67,6 @@ void show_regs(struct pt_regs *regs)
        pr_err("A31: %08lx  B31: %08lx\n", regs->a31, regs->b31);
 }
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_stack(current, &stack);
-}
-EXPORT_SYMBOL(dump_stack);
 void die(char *str, struct pt_regs *fp, int nr)
 {
        console_verbose();
diff --git a/arch/cris/kernel/traps.c b/arch/cris/kernel/traps.c
index a11ad3229f8c..0ffda73734f5 100644
--- a/arch/cris/kernel/traps.c
+++ b/arch/cris/kernel/traps.c
@@ -147,13 +147,6 @@ show_stack(void)
 #endif
 void
-dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
-void
 set_nmi_handler(void (*handler)(struct pt_regs *))
 {
        nmi_handler = handler;
diff --git a/arch/frv/kernel/traps.c b/arch/frv/kernel/traps.c
index 5cfd1420b091..cfcd802d6f9c 100644
--- a/arch/frv/kernel/traps.c
+++ b/arch/frv/kernel/traps.c
@@ -466,17 +466,6 @@ asmlinkage void compound_exception(unsigned long esfr1,
        BUG();
 } /* end compound_exception() */
-/*****************************************************************************/
-/*
- * The architecture-independent backtrace generator
- */
-void dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 void show_stack(struct task_struct *task, unsigned long *sp)
 {
 }
diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
index 7833aa3e7c7d..cfe494dbe3da 100644
--- a/arch/h8300/kernel/traps.c
+++ b/arch/h8300/kernel/traps.c
@@ -164,10 +164,3 @@ void show_trace_task(struct task_struct *tsk)
 {
        show_stack(tsk,(unsigned long *)tsk->thread.esp0);
 }
-void dump_stack(void)
-{
-        show_stack(NULL,NULL);
-}
-EXPORT_SYMBOL(dump_stack);
diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index be5e2dd9c9d3..cc2171b2aa04 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -191,14 +191,6 @@ void show_stack(struct task_struct *task, unsigned long *fp)
        do_show_stack(task, fp, 0);
 }
-void dump_stack(void)
-{
-        unsigned long *fp;
-        asm("%0 = r30" : "=r" (fp));
-        show_stack(current, fp);
-}
-EXPORT_SYMBOL(dump_stack);
 int die(const char *str, struct pt_regs *regs, long err)
 {
        static struct {
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index a26fc640e4ce..182bd64cc726 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -96,14 +96,6 @@ show_stack (struct task_struct *task, unsigned long *sp)
 }
 void
-dump_stack (void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
-void
 show_regs (struct pt_regs *regs)
 {
        unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;
diff --git a/arch/m32r/kernel/traps.c b/arch/m32r/kernel/traps.c
index 9fe3467a5133..a7a424f852e4 100644
--- a/arch/m32r/kernel/traps.c
+++ b/arch/m32r/kernel/traps.c
@@ -167,15 +167,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        show_trace(task, sp);
 }
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_trace(current, &stack);
-}
-EXPORT_SYMBOL(dump_stack);
 static void show_registers(struct pt_regs *regs)
 {
        int i = 0;
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index f32ab22e7ed3..88fcd8c70e7b 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -992,18 +992,6 @@ void show_stack(struct task_struct *task, unsigned long *stack)
 }
 /*
- * The architecture-independent backtrace generator
- */
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_trace(&stack);
-}
-EXPORT_SYMBOL(dump_stack);
-/*
 * The vector number returned in the frame pointer may also contain
 * the "fs" (Fault Status) bits on ColdFire. These are in the bottom
 * 2 bits, and upper 2 bits. So we need to mask out the real vector
diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c
index 8961f247b500..2ceeaae5b199 100644
--- a/arch/metag/kernel/traps.c
+++ b/arch/metag/kernel/traps.c
@@ -987,9 +987,3 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
        show_trace(tsk, sp, NULL);
 }
-void dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
index 30e6b5004a6a..cb619533a192 100644
--- a/arch/microblaze/kernel/traps.c
+++ b/arch/microblaze/kernel/traps.c
@@ -75,9 +75,3 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        debug_show_held_locks(task);
 }
-void dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index c3abb88170fc..b512b28cf786 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -206,19 +206,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        show_stacktrace(task, &regs);
 }
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-        struct pt_regs regs;
-        prepare_frametrace(&regs);
-        show_backtrace(current, &regs);
-}
-EXPORT_SYMBOL(dump_stack);
 static void show_code(unsigned int __user *pc)
 {
        long i;
diff --git a/arch/mn10300/kernel/traps.c b/arch/mn10300/kernel/traps.c
index b900e5afa0ae..a7a987c7954f 100644
--- a/arch/mn10300/kernel/traps.c
+++ b/arch/mn10300/kernel/traps.c
@@ -294,17 +294,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
 }
 /*
- * the architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_stack(current, &stack);
-}
-EXPORT_SYMBOL(dump_stack);
-/*
 * dump the register file in the specified exception frame
 */
 void show_registers_only(struct pt_regs *regs)
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
index 5cce396016d0..3d3f6062f49c 100644
--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -105,17 +105,6 @@ void show_trace_task(struct task_struct *tsk)
         */
 }
-/*
- * The architecture-independent backtrace generator
- */
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_stack(current, &stack);
-}
-EXPORT_SYMBOL(dump_stack);
 void show_registers(struct pt_regs *regs)
 {
        int i;
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index aeb8f8f2c07a..e64cf5f09b62 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -158,14 +158,6 @@ void show_regs(struct pt_regs *regs)
        }
 }
-void dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 static void do_show_stack(struct unwind_frame_info *info)
 {
        int i = 1;
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 16e77a81ab4f..624d44bb44dc 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1362,12 +1362,6 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
        } while (count++ < kstack_depth_to_print);
 }
-void dump_stack(void)
-{
-        show_stack(current, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 #ifdef CONFIG_PPC64
 /* Called with hard IRQs off */
 void __ppc64_runlatch_on(void)
diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c
index 03dce39d01ee..2f1f639d1a3d 100644
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@@ -129,23 +129,6 @@ static void show_last_breaking_event(struct pt_regs *regs)
 #endif
 }
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-        printk("CPU: %d %s %s %.*s\n",
-               task_thread_info(current)->cpu, print_tainted(),
-               init_utsname()->release,
-               (int)strcspn(init_utsname()->version, " "),
-               init_utsname()->version);
-        printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
-               current->comm, current->pid, current,
-               (void *) current->thread.ksp);
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
 {
        return (regs->psw.mask & bits) / ((~bits + 1) & bits);
diff --git a/arch/score/kernel/traps.c b/arch/score/kernel/traps.c
index 0e46fb19a848..a38f435fba7b 100644
--- a/arch/score/kernel/traps.c
+++ b/arch/score/kernel/traps.c
@@ -149,16 +149,6 @@ static void show_registers(struct pt_regs *regs)
        printk(KERN_NOTICE "\n");
 }
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-        show_stack(current_thread_info()->task,
-                   (long *) get_irq_regs()->regs[0]);
-}
-EXPORT_SYMBOL(dump_stack);
 void __die(const char *str, struct pt_regs *regs, const char *file,
        const char *func, unsigned long line)
 {
diff --git a/arch/sh/kernel/dumpstack.c b/arch/sh/kernel/dumpstack.c
index 7617dc4129ac..b959f5592604 100644
--- a/arch/sh/kernel/dumpstack.c
+++ b/arch/sh/kernel/dumpstack.c
@@ -158,9 +158,3 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
                 (unsigned long)task_stack_page(tsk));
        show_trace(tsk, sp, NULL);
 }
-void dump_stack(void)
-{
-        show_stack(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 2be4214b3905..dccf5f58d70f 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -164,13 +164,6 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
        printk("\n");
 }
-void dump_stack(void)
-{
-        show_stack(current, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 /*
 * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
 */
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index 8d38ca97aa23..b3f833ab90eb 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2350,13 +2350,6 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
        } while (++count < 16);
 }
-void dump_stack(void)
-{
-        show_stack(current, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 static inline struct reg_window *kernel_stack_up(struct reg_window *rw)
 {
        unsigned long fp = rw->ins[6];
diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index e562ff80409a..7d101a2a1541 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -35,18 +35,6 @@ void show_trace(struct task_struct *task, unsigned long * stack)
 }
 #endif
-/*
- * stack dumps generator - this is used by arch-independent code.
- * And this is identical to i386 currently.
- */
-void dump_stack(void)
-{
-        unsigned long stack;
-        show_trace(current, &stack);
-}
-EXPORT_SYMBOL(dump_stack);
 /*Stolen from arch/i386/kernel/traps.c */
 static const int kstack_depth_to_print = 24;
diff --git a/arch/unicore32/kernel/traps.c b/arch/unicore32/kernel/traps.c
index 0870b68d2ad9..c54e32410ead 100644
--- a/arch/unicore32/kernel/traps.c
+++ b/arch/unicore32/kernel/traps.c
@@ -170,12 +170,6 @@ static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
                c_backtrace(fp, mode);
 }
-void dump_stack(void)
-{
-        dump_backtrace(NULL, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 void show_stack(struct task_struct *tsk, unsigned long *sp)
 {
        dump_backtrace(NULL, tsk);
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index dd1a7c391c90..deb6421c9e69 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -191,24 +191,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        show_stack_log_lvl(task, NULL, sp, bp, "");
 }
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-        unsigned long bp;
-        unsigned long stack;
-        bp = stack_frame(current, NULL);
-        printk("Pid: %d, comm: %.20s %s %s %.*s\n",
-                current->pid, current->comm, print_tainted(),
-                init_utsname()->release,
-                (int)strcspn(init_utsname()->version, " "),
-                init_utsname()->version);
-        show_trace(NULL, NULL, &stack, bp);
-}
-EXPORT_SYMBOL(dump_stack);
 static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
 static int die_owner = -1;
 static unsigned int die_nest_count;
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 923db5c15278..384b7c7c2f6d 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -481,14 +481,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
        show_trace(task, stack);
 }
-void dump_stack(void)
-{
-        show_stack(current, NULL);
-}
-EXPORT_SYMBOL(dump_stack);
 void show_code(unsigned int *pc)
 {
        long i;
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 4890fe62c011..7ce1f878cf6a 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -145,6 +145,7 @@ extern void wake_up_klogd(void);
 void log_buf_kexec_setup(void);
 void __init setup_log_buf(int early);
+void dump_stack_print_info(const char *log_lvl);
 #else
 static inline __printf(1, 0)
 int vprintk(const char *s, va_list args)
@@ -182,6 +183,10 @@ static inline void log_buf_kexec_setup(void)
 static inline void setup_log_buf(int early)
 {
 }
+static inline void dump_stack_print_info(const char *log_lvl)
+{
+}
 #endif
 extern void dump_stack(void) __cold;
diff --git a/kernel/printk.c b/kernel/printk.c
index 376914e2869d..70b4b94a0eca 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -43,6 +43,7 @@
 #include <linux/rculist.h>
 #include <linux/poll.h>
 #include <linux/irq_work.h>
+#include <linux/utsname.h>
 #include <asm/uaccess.h>
@@ -2849,4 +2850,21 @@ void kmsg_dump_rewind(struct kmsg_dumper *dumper)
        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
 }
 EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
+/**
+ * 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);
+}
 #endif
diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index 42f4f55c9458..53bad099ebd6 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -5,11 +5,16 @@
 #include <linux/kernel.h>
 #include <linux/export.h>
+#include <linux/sched.h>
+/**
+ * dump_stack - dump the current task information and its stack trace
+ *
+ * Architectures can override this implementation by implementing its own.
+ */
 void dump_stack(void)
 {
-        printk(KERN_NOTICE
+        dump_stack_print_info(KERN_DEFAULT);
-                "This architecture does not implement dump_stack()\n");
+        show_stack(NULL, NULL);
 }
 EXPORT_SYMBOL(dump_stack);