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

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Date: Tue, 6 Feb 2024 15:13:46 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Jens Axboe <axboe@...nel.dk>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux Next
 Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warnings after merge of the block tree

Hi all,

On Tue, 6 Feb 2024 13:10:50 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> 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.

This became a build failure in the i386 defconfig build, so I reverted commit

  efaf6760976d ("Merge branch 'for-6.9/io_uring' into for-next")

i.e. the merge of the whole topic branch.

-- 
Cheers,
Stephen Rothwell

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