On Tue, Sep 12, 2023 at 12:15:41PM -0700, Nathan Chancellor wrote:
> When building bcachefs for 32-bit ARM, there is a compiler warning in
> bch2_bucket_gens_invalid() due to use of an incorrect format specifier:
>
> fs/bcachefs/alloc_background.c:530:10: error: format specifies type
> 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int')
> [-Werror,-Wformat]
> 529 | prt_printf(err, "bad val size (%lu != %zu)",
> | ~~~
> | %zu
> 530 | bkey_val_bytes(k.k), sizeof(struct
> bch_bucket_gens));
> | ^~~~~~~~~~~~~~~~~~~
> fs/bcachefs/util.h:223:54: note: expanded from macro 'prt_printf'
> 223 | #define prt_printf(_out, ...) bch2_prt_printf(_out,
> __VA_ARGS__)
> |
> ^~~~~~~~~~~
>
> On 64-bit architectures, size_t is 'unsigned long', so there is no
> warning when using %lu but on 32-bit architectures, size_t is 'unsigned
> int'. Use '%zu', the format specifier for 'size_t', to eliminate the
> warning.
>
> Fixes: 4be0d766a7e9 ("bcachefs: bucket_gens btree")
> Signed-off-by: Nathan Chancellor <[email protected]>
Reviewed-by: Justin Stitt <[email protected]>
> ---
> fs/bcachefs/alloc_background.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/bcachefs/alloc_background.c b/fs/bcachefs/alloc_background.c
> index 67e73864823c..2b0d155d1ed5 100644
> --- a/fs/bcachefs/alloc_background.c
> +++ b/fs/bcachefs/alloc_background.c
> @@ -526,7 +526,7 @@ int bch2_bucket_gens_invalid(const struct bch_fs *c,
> struct bkey_s_c k,
> struct printbuf *err)
> {
> if (bkey_val_bytes(k.k) != sizeof(struct bch_bucket_gens)) {
> - prt_printf(err, "bad val size (%lu != %zu)",
> + prt_printf(err, "bad val size (%zu != %zu)",
> bkey_val_bytes(k.k), sizeof(struct bch_bucket_gens));
> return -BCH_ERR_invalid_bkey;
> }
>
> --
> 2.42.0
>
