[PATCH] i386: cpu_relax() in crash.c and doublefault.c

Add cpu_relax() to infinite loops in crash.c and doublefault.c.  This is
the safest change.
Signed-off-by: NChuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/i386/kernel/crash.c

@@ -114,7 +114,8 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu)
 	atomic_dec(&waiting_for_crash_ipi);
 	/* Assume hlt works */
 	halt();
-	for(;;);
+	for (;;)
+		cpu_relax();
 
 	return 1;
 }

arch/i386/kernel/doublefault.c

@@ -44,7 +44,8 @@ static void doublefault_fn(void)
 		}
 	}
 
-	for (;;) /* nothing */;
+	for (;;)
+		cpu_relax();
 }
 
 struct tss_struct doublefault_tss __cacheline_aligned = {