Re: [PATCH] dm cache: fix divide error in too_many_discard_blocks()

[syzbot]

> #syz test

This crash does not have a reproducer. I cannot test it.

>
> diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
> index 1a5072425c4a..2d40d6047ef1 100644
> --- a/drivers/md/dm-cache-target.c
> +++ b/drivers/md/dm-cache-target.c
> @@ -2383,9 +2383,7 @@ static int create_cache_policy(struct cache *cache, struct cache_args *ca,
>  static bool too_many_discard_blocks(sector_t discard_block_size,
>  				    sector_t origin_size)
>  {
> -	(void) sector_div(origin_size, discard_block_size);
> -
> -	return origin_size > MAX_DISCARD_BLOCKS;
> +	return div64_u64(origin_size, discard_block_size) > MAX_DISCARD_BLOCKS;
>  }
>  
>  static sector_t calculate_discard_block_size(sector_t cache_block_size,
> -- 
> 2.43.0
>