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* [PATCH] btrfs: fix Wmaybe-uninitialized warning
@ 2019-09-03  3:30 Austin Kim
  2019-09-10 16:39 ` Austin Kim
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Austin Kim @ 2019-09-03  3:30 UTC (permalink / raw)
  To: clm, josef, dsterba; +Cc: linux-btrfs, linux-kernel, austindh.kim

gcc throws warning message as below:

‘clone_src_i_size’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
 #define IS_ALIGNED(x, a)  (((x) & ((typeof(x))(a) - 1)) == 0)
                       ^
fs/btrfs/send.c:5088:6: note: ‘clone_src_i_size’ was declared here
 u64 clone_src_i_size;
   ^
The clone_src_i_size is only used as call-by-reference
in a call to get_inode_info().

Silence the warning by initializing clone_src_i_size to 0.

Signed-off-by: Austin Kim <austindh.kim@gmail.com>
---
 fs/btrfs/send.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index f856d6c..197536b 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -5085,7 +5085,7 @@ static int clone_range(struct send_ctx *sctx,
 	struct btrfs_path *path;
 	struct btrfs_key key;
 	int ret;
-	u64 clone_src_i_size;
+	u64 clone_src_i_size = 0;
 
 	/*
 	 * Prevent cloning from a zero offset with a length matching the sector
-- 
2.6.2


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2019-09-03  3:30 [PATCH] btrfs: fix Wmaybe-uninitialized warning Austin Kim
2019-09-10 16:39 ` Austin Kim
2019-09-17 10:12 ` David Sterba
2019-10-07 15:03 ` David Sterba

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