commit 0448027b765ec7ede580a1630c23fe7cf4bd0b05
Author: Justin Maggard <jmaggard10@gmail.com>
Date:   Fri Oct 24 17:55:02 2014 -0700

    Grow: fix resize of array component size to > 32bits
    
    If the request --size to --grow an array to is larger
    than 32bits, then mdadm may make the wrong choice and
    use ioctl instead of setting component_size via sysfs
    and the change is ignored.
    
    Instead of using casts to check for a 32-bit overflow,
    just check for set bits outside of INT32_MAX.
    
    Fixes: 4e9a3dd16d656b269f5602624ac4f7109a571368
    Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/Grow.c b/Grow.c
index 76bb35a..a0f7526 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1818,7 +1818,7 @@ int Grow_reshape(char *devname, int fd,
 		if (s->size == MAX_SIZE)
 			s->size = 0;
 		array.size = s->size;
-		if (array.size != (signed)s->size) {
+		if (s->size & ~INT32_MAX) {
 			/* got truncated to 32bit, write to
 			 * component_size instead
 			 */