Subject: Re: linux-next: build warnings after merge of the block tree

From: Jens Axboe <[email-masked]>
Date: Mon, 2 Mar 2020 19:59:08 -0700

On 3/2/20 6:41 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the block tree, today's linux-next build (arm
> multi_v7_defconfig) produced these warnings:
> 
> fs/io_uring.c: In function 'io_put_kbuf':
> fs/io_uring.c:1651:27: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>  1651 |  struct io_buffer *kbuf = (struct io_buffer *) req->rw.addr;
>       |                           ^
> fs/io_uring.c: In function 'io_rw_buffer_select':
> fs/io_uring.c:2209:27: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>  2209 |  struct io_buffer *kbuf = (struct io_buffer *) req->rw.addr;
>       |                           ^
> fs/io_uring.c:2216:17: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
>  2216 |  req->rw.addr = (u64) kbuf;
>       |                 ^
> fs/io_uring.c: In function 'io_cleanup_req':
> fs/io_uring.c:4897:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
>  4897 |    kfree((void *)req->rw.addr);
>       |          ^
> 
> Introduced by commits
> 
>   7efcbb97deab ("io_uring: support buffer selection for OP_READ and OP_RECV")
>   8cab19f460b6 ("io_uring: add IOSQE_BUFFER_SELECT support for IORING_OP_READV")

Thanks Stephen, I added a fixup patch. I wish we had u64_to_ptr() and
ptr_to_u64(), but that's only for the __user pointers...

-- 
Jens Axboe