[SPARC]: Add reboot_command[] extern decl to asm/system.h

Kill off some sparse warnings.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c
index 0bd69d0..70c0dd2 100644
--- a/arch/sparc/kernel/process.c
+++ b/arch/sparc/kernel/process.c
@@ -139,8 +139,6 @@
 
 #endif
 
-extern char reboot_command [];
-
 /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
 void machine_halt(void)
 {
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 2aafce7..e116e38 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -114,8 +114,6 @@
 	}
 }
 
-extern char reboot_command [];
-
 void machine_halt(void)
 {
 	sstate_halt();
diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
index 45e47c1..4e08210c 100644
--- a/include/asm-sparc/system.h
+++ b/include/asm-sparc/system.h
@@ -44,6 +44,8 @@
 
 #define SUN4M_NCPUS            4              /* Architectural limit of sun4m. */
 
+extern char reboot_command[];
+
 extern struct thread_info *current_set[NR_CPUS];
 
 extern unsigned long empty_bad_page;
diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h
index ed91a5d..53eae09 100644
--- a/include/asm-sparc64/system.h
+++ b/include/asm-sparc64/system.h
@@ -30,6 +30,8 @@
 #define ARCH_SUN4C_SUN4 0
 #define ARCH_SUN4 0
 
+extern char reboot_command[];
+
 /* These are here in an effort to more fully work around Spitfire Errata
  * #51.  Essentially, if a memory barrier occurs soon after a mispredicted
  * branch, the chip can stop executing instructions until a trap occurs.