From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: drivers/block/null_blk_main.c: fix uninitialized var warnings
With gcc-7.2, many instances of
drivers/block/null_blk_main.c: In function ‘nullb_device_zone_nr_conv_store’:
drivers/block/null_blk_main.c:291:12: warning: ‘new_value’ may be used uninitialized in this function [-Wmaybe-uninitialized]
dev->NAME = new_value; \
^
drivers/block/null_blk_main.c:279:7: note: ‘new_value’ was declared here
TYPE new_value; \
^
Presumably notabug, so use uninitialized_var() to suppress them.
Cc: Shaohua Li <shli@xxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/null_blk_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/block/null_blk_main.c~drivers-block-null_blk_mainc-fix-uninitialized-var-warnings
+++ a/drivers/block/null_blk_main.c
@@ -276,7 +276,7 @@ nullb_device_##NAME##_store(struct confi
{ \
int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY;\
struct nullb_device *dev = to_nullb_device(item); \
- TYPE new_value; \
+ TYPE uninitialized_var(new_value); \
int ret; \
\
ret = nullb_device_##TYPE##_attr_store(&new_value, page, count);\
_
