x86: add the capability to print fuzzy backtraces

For enhancing the 32 bit EBP based backtracer, I need the capability
for the backtracer to tell it's customer that an entry is either
reliable or unreliable, and the backtrace printing code then needs to
print the unreliable ones slightly different.

This patch adds the basic capability, the next patch will add a user
of this capability.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 6 insertions, 4 deletions

diff --git a/include/asm-x86/kdebug.h b/include/asm-x86/kdebug.h
index e9f42d1ac38f..dd442a1632c0 100644
--- a/include/asm-x86/kdebug.h
+++ b/include/asm-x86/kdebug.h
@@ -22,12 +22,13 @@ enum die_val {
         DIE_PAGE_FAULT,
 };
 
-extern void printk_address(unsigned long address);
+extern void printk_address(unsigned long address, int reliable);
 extern void die(const char *,struct pt_regs *,long);
 extern int __must_check __die(const char *, struct pt_regs *, long);
 extern void show_registers(struct pt_regs *regs);
 extern void __show_registers(struct pt_regs *, int all);
-extern void show_trace(struct task_struct *, struct pt_regs *, unsigned long *);
+extern void show_trace(struct task_struct *t, struct pt_regs *regs,
+                        unsigned long *sp, unsigned long bp);
 extern void __show_regs(struct pt_regs *regs);
 extern void show_regs(struct pt_regs *regs);
 extern void dump_pagetable(unsigned long);
diff --git a/include/asm-x86/stacktrace.h b/include/asm-x86/stacktrace.h
index 70dd5bae3235..30f82526a8e2 100644
--- a/include/asm-x86/stacktrace.h
+++ b/include/asm-x86/stacktrace.h
@@ -9,12 +9,13 @@ struct stacktrace_ops {
         void (*warning)(void *data, char *msg);
         /* msg must contain %s for the symbol */
         void (*warning_symbol)(void *data, char *msg, unsigned long symbol);
-        void (*address)(void *data, unsigned long address);
+        void (*address)(void *data, unsigned long address, int reliable);
         /* On negative return stop dumping */
         int (*stack)(void *data, char *name);
 };
 
-void dump_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack,
+void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
+                unsigned long *stack, unsigned long bp,
                 const struct stacktrace_ops *ops, void *data);
 
 #endif