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

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Message-ID: <CAMuHMdWjAKbt_bne8Mjpg3N_7R8TcKvAoVV8T4VrwTC2apAr_g@mail.gmail.com>
Date: Tue, 6 Feb 2024 12:12:36 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Jens Axboe <axboe@...nel.dk>, 
	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

On Tue, Feb 6, 2024 at 3:11 AM 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.

All of these BIT() have to be changed to BIT_ULL().
And let's hope all variables used for storing these flags have been
changed from unsigned long to u64...

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds