linux-kernel - Re: linux-next: build failure after merge of the tip tree

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Message-id: <172844652013.444407.16580824583469743404@noble.neil.brown.name>
Date: Wed, 09 Oct 2024 15:02:00 +1100
From: "NeilBrown" <neilb@...e.de>
To: "Stephen Rothwell" <sfr@...b.auug.org.au>
Cc: "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>,
 "H. Peter Anvin" <hpa@...or.com>, "Peter Zijlstra" <peterz@...radead.org>,
 "Kent Overstreet" <kent.overstreet@...ux.dev>,
 "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
 "Linux Next Mailing List" <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the tip tree

On Wed, 09 Oct 2024, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> In file included from include/linux/fs.h:6,
>                  from include/linux/highmem.h:5,
>                  from include/linux/bvec.h:10,
>                  from include/linux/blk_types.h:10,
>                  from include/linux/bio.h:10,
>                  from fs/bcachefs/bcachefs.h:188,
>                  from fs/bcachefs/fs.c:4:
> fs/bcachefs/fs.c: In function '__wait_on_freeing_inode':
> fs/bcachefs/fs.c:281:31: error: initialization of 'long unsigned int *' from incompatible pointer type 'u32 *' {aka 'unsigned int *'} [-Wincompatible-pointer-types]
>   281 |         DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);

The fix we want is to replace that line with
   struct wait_bit_queue_entry wait;
I should have checked more carefully - sorry.

I guess we wait for rc3?

Kent: could you please make that change?  The inode_bit_waitqueue() does
initialisation equivalent of DEFINE_WAIT_BIT() so you only need the declaration.

Thanks,
NeilBrown

>       |                               ^
> include/linux/wait_bit.h:22:20: note: in definition of macro '__WAIT_BIT_KEY_INITIALIZER'
>    22 |         { .flags = word, .bit_nr = bit, }
>       |                    ^~~~
> fs/bcachefs/fs.c:281:9: note: in expansion of macro 'DEFINE_WAIT_BIT'
>   281 |         DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
>       |         ^~~~~~~~~~~~~~~
> fs/bcachefs/fs.c:281:31: note: (near initialization for 'wait.key.flags')
>   281 |         DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
>       |                               ^
> include/linux/wait_bit.h:22:20: note: in definition of macro '__WAIT_BIT_KEY_INITIALIZER'
>    22 |         { .flags = word, .bit_nr = bit, }
>       |                    ^~~~
> fs/bcachefs/fs.c:281:9: note: in expansion of macro 'DEFINE_WAIT_BIT'
>   281 |         DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
>       |         ^~~~~~~~~~~~~~~
> 
> Caused by commit
> 
>   2382d68d7d43 ("sched: change wake_up_bit() and related function to expect unsigned long *")
> 
> I have reverted commit
> 
>   35f4c66b66c4 ("Merge branch into tip/master: 'sched/core'")
> 
> for today.
> 
> -- 
> Cheers,
> Stephen Rothwell
>