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drivers/block/null_blk_main.c: fix uninitialized var warnings

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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@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2020-02-03 17:34:52 -08:00 committed by Linus Torvalds
parent ca0a95a6ac
commit 046755a28f
1 changed files with 1 additions and 1 deletions
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2
drivers/block/null_blk_main.c
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@ -276,7 +276,7 @@ nullb_device_##NAME##_store(struct config_item *item, const char *page, \
{ \
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);\