File: gcc-constprop.patch

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diff -Nupr src.orig/kernel/time/timekeeping.c src/kernel/time/timekeeping.c
--- src.orig/kernel/time/timekeeping.c	2017-09-22 15:27:21.602055778 -0400
+++ src/kernel/time/timekeeping.c	2017-09-22 15:27:27.522080292 -0400
@@ -877,6 +877,9 @@ void do_gettimeofday(struct timeval *tv)
 {
 	struct timespec64 now;
 
+	if (!tv)
+		return;
+
 	getnstimeofday64(&now);
 	tv->tv_sec = now.tv_sec;
 	tv->tv_usec = now.tv_nsec/1000;