Re: [PATCH] blk-throttle: fix divide-by-zero on legacy iops limit of 0

On Wed, 15 Jul 2026 20:44:19 +0800
Tao Cui <[email protected]> wrote:

> 在 2026/7/14 19:37, David Laight 写道:
...
> >>  	tg_update_slice(tg, rw);
> >> @@ -1386,7 +1391,8 @@ static ssize_t tg_set_conf(struct kernfs_open_file *of,
> >>  	if (is_u64)
> >>  		*(u64 *)((void *)tg + of_cft(of)->private) = v;
> >>  	else
> >> -		*(unsigned int *)((void *)tg + of_cft(of)->private) = v;
> >> +		*(unsigned int *)((void *)tg + of_cft(of)->private) =
> >> +			min_t(u64, v, UINT_MAX);  
> > 
> > The LHS casts look horrid - there has to be a nicer way to do that.
> > 
> > And you don't need min_t() a plain min() will be fine.
> >   
> Hi David,
> 
> Both done in v2 — introduced a void *field local so the writes read
> *(u64 *)field / *(unsigned int *)field, and switched to
> min(v, (u64)UINT_MAX).

You don't need the cast either.

	David

> 
> Thanks,
> Tao
> > 	David
> > 
> > 
> >   
> >>  
> >>  	tg_conf_updated(tg, false);
> >>  	ret = 0;  
> >   
>