linux-kernel - Re: include/linux/compiler_types.h:326:38: error: call to '__compiletime_assert_791' declared with attribute error: BUILD_BUG_ON failed: (BTRFS_MAX_COMPRESSED % PAGE

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Date:   Wed, 9 Jun 2021 17:22:29 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     kernel test robot <lkp@...el.com>, linux-btrfs@...r.kernel.org,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: include/linux/compiler_types.h:326:38: error: call to
 '__compiletime_assert_791' declared with attribute error: BUILD_BUG_ON
 failed: (BTRFS_MAX_COMPRESSED % PAGE_SIZE) != 0

On Wed, Jun 09, 2021 at 04:01:20PM +0200, Christophe Leroy wrote:
> Le 09/06/2021 à 15:55, kernel test robot a écrit :
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   368094df48e680fa51cedb68537408cfa64b788e
> > commit: 4eeef098b43242ed145c83fba9989d586d707589 powerpc/44x: Remove STDBINUTILS kconfig option
> > date:   4 months ago
> > config: powerpc-randconfig-r012-20210609 (attached as .config)
> > compiler: powerpc-linux-gcc (GCC) 9.3.0
> 
> That's a BTRFS issue, and not directly linked to the above mentioned commit. Before that commit the 
> problem was already present.
> 
> Problem is that with 256k PAGE_SIZE, following BUILD_BUG() pops up:
> 
> BUILD_BUG_ON((BTRFS_MAX_COMPRESSED % PAGE_SIZE) != 0)

A 256K page is a problem for btrfs, until now I was not even aware
there's an architecture supporting that so. That the build fails is
probably best thing. Maximum metadata nodesize supported is 64K and
having that on a 256K page would need deeper changes, no top of the
currently developed subpage changes (that do 4K blocks on 64K pages).