[PATCH][next] bcache: Replace zero-length arrays with DECLARE_FLEX_ARRAY() helper

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Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/213
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
 drivers/md/bcache/bcache_ondisk.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/md/bcache/bcache_ondisk.h b/drivers/md/bcache/bcache_ondisk.h
index 97413586195b..d086a0ce4bc2 100644
--- a/drivers/md/bcache/bcache_ondisk.h
+++ b/drivers/md/bcache/bcache_ondisk.h
@@ -359,8 +359,8 @@ struct jset {
 	__u64			prio_bucket[MAX_CACHES_PER_SET];
 
 	union {
-		struct bkey	start[0];
-		__u64		d[0];
+		DECLARE_FLEX_ARRAY(struct bkey, start);
+		DECLARE_FLEX_ARRAY(__u64, d);
 	};
 };
 
@@ -424,8 +424,8 @@ struct bset {
 	__u32			keys;
 
 	union {
-		struct bkey	start[0];
-		__u64		d[0];
+		DECLARE_FLEX_ARRAY(struct bkey, start);
+		DECLARE_FLEX_ARRAY(__u64, d);
 	};
 };
 
-- 
2.34.1




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