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

From: Jens Axboe <[email-masked]>
Date: Tue, 6 Feb 2024 07:49:22 -0700

On 2/5/24 7:10 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the block tree, today's linux-next build (arm
> multi_v7_defconfig) produced these warnings:
> 
> In file included from /home/sfr/next/next/include/linux/bits.h:6,
>                  from /home/sfr/next/next/include/linux/bitops.h:6,
>                  from /home/sfr/next/next/include/linux/kernel.h:23,
>                  from /home/sfr/next/next/io_uring/nop.c:2:
> /home/sfr/next/next/include/vdso/bits.h:7:40: warning: left shift count >= width of type [-Wshift-count-overflow]
>     7 | #define BIT(nr)                 (UL(1) << (nr))
>       |                                        ^~
> /home/sfr/next/next/include/linux/io_uring_types.h:538:35: note: in expansion of macro 'BIT'
>   538 |         REQ_F_CAN_POLL          = BIT(REQ_F_CAN_POLL_BIT),
>       |                                   ^~~
> 
> (and mny more similar)
> 
> Introduced by commit
> 
>   d964e8440442 ("io_uring: add io_file_can_poll() helper")
> 
> REQ_F_CAN_POLL_BIT is 32.

Oops yes, didn't get around to 32-bit compiles just yet. I'll fix it
up, thanks.

-- 
Jens Axboe