x86, asmlinkage: Make dump_stack visible

dump_stack is used from assembler code, so make it visible.

Signed-off-by: Andi Kleen <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: H. Peter Anvin <[e-mail]>

include/linux/printk.h

···
 }
 #endif
 
-extern void dump_stack(void) __cold;
+extern asmlinkage void dump_stack(void) __cold;
 
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt

lib/dump_stack.c

···
 #ifdef CONFIG_SMP
 static atomic_t dump_lock = ATOMIC_INIT(-1);
 
-void dump_stack(void)
+asmlinkage void dump_stack(void)
 {
 	int was_locked;
 	int old;
···
 	preempt_enable();
 }
 #else
-void dump_stack(void)
+asmlinkage void dump_stack(void)
 {
 	__dump_stack();
 }