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bcache: explicity type cast in bset_bkey_last()

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In bset.h, macro bset_bkey_last() is defined as,
    bkey_idx((struct bkey *) (i)->d, (i)->keys)

Parameter i can be variable type of data structure, the macro always
works once the type of struct i has member 'd' and 'keys'.

bset_bkey_last() is also used in macro csum_set() to calculate the
checksum of a on-disk data structure. When csum_set() is used to
calculate checksum of on-disk bcache super block, the parameter 'i'
data type is struct cache_sb_disk. Inside struct cache_sb_disk (also in
struct cache_sb) the member keys is __u16 type. But bkey_idx() expects
unsigned int (a 32bit width), so there is problem when sending
parameters via stack to call bkey_idx().

Sparse tool from Intel 0day kbuild system reports this incompatible
problem. bkey_idx() is part of user space API, so the simplest fix is
to cast the (i)->keys to unsigned int type in macro bset_bkey_last().

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2020-02-01 22:42:32 +08:00 committed by Jens Axboe
parent 5bebf7486d
commit 7c02b0055f
1 changed files with 2 additions and 1 deletions
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3
drivers/md/bcache/bset.h
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@ -397,7 +397,8 @@ void bch_btree_keys_stats(struct btree_keys *b, struct bset_stats *state);
/* Bkey utility code */
#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, (i)->keys)
#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, \
(unsigned int)(i)->keys)
static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned int idx)
{