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

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Date: Tue, 6 Feb 2024 14:42:42 +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 12:12 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> 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...

I have sent a fix
https://lore.kernel.org/1960190f37b94276df50d382b9f1488cd6b6e662.1707226862git.geert+renesas@glider.be

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