Hi Chen,
On Sat, 2013-12-21 at 10:08 +0800, Chen Gang wrote:
> In kernel, need use div64_u64_rem() instead of operator '%' for u64, or
> can not pass compiling (with allmodconfig under metag):
>
> MODPOST 2909 modules
> ERROR: "__umoddi3" [drivers/target/target_core_mod.ko] undefined!
>
> Also need u64 type cast for u32 variable multiply u32 variable, or will
> cause type overflow issue.
>
>
> Signed-off-by: Chen Gang <gang.chen.5...@gmail.com>
> ---
> drivers/target/target_core_alua.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
FYI, this unsigned long long division in core_alua_state_lba_dependent()
was fixed for 32-bit in linux-next >= 12192013 code.
Regardless, thanks for your patch.
--nab
> diff --git a/drivers/target/target_core_alua.c
> b/drivers/target/target_core_alua.c
> index dc0d399..ff2aadc 100644
> --- a/drivers/target/target_core_alua.c
> +++ b/drivers/target/target_core_alua.c
> @@ -489,7 +489,8 @@ static inline int core_alua_state_lba_dependent(
> u64 first_lba = map->lba_map_first_lba;
>
> if (segment_mult) {
> - start_lba = lba % (segment_size * segment_mult);
> + u64 tmp = (u64)segment_size * segment_mult;
> + div64_u64_rem(lba, tmp, &start_lba);
> last_lba = first_lba + segment_size - 1;
> if (start_lba >= first_lba &&
> start_lba <= last_lba) {
--
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