[PATCH] uml: comment the initialization of a global

Comment the fact that sig_info is initialized early in boot, and thus doesn't
need any locking.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/os-Linux/trap.c

@@ -16,6 +16,7 @@ void usr2_handler(int sig, union uml_pt_regs *regs)
 	CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
 }
 
+/* Initialized from linux_main() */
 void (*sig_info[NSIG])(int, union uml_pt_regs *);
 
 void os_fill_handlinfo(struct kern_handlers h)