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    Subject[PATCH 5.10 160/593] btrfs: disable build on platforms having page size 256K
    Date
    From: Christophe Leroy <christophe.leroy@csgroup.eu>

    [ Upstream commit b05fbcc36be1f8597a1febef4892053a0b2f3f60 ]

    With a config having PAGE_SIZE set to 256K, BTRFS build fails
    with the following message

    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

    BTRFS_MAX_COMPRESSED being 128K, BTRFS cannot support platforms with
    256K pages at the time being.

    There are two platforms that can select 256K pages:
    - hexagon
    - powerpc

    Disable BTRFS when 256K page size is selected. Supporting this would
    require changes to the subpage mode that's currently being developed.
    Given that 256K is many times larger than page sizes commonly used and
    for what the algorithms and structures have been tuned, it's out of
    scope and disabling build is a reasonable option.

    Reported-by: kernel test robot <lkp@intel.com>
    Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
    [ update changelog ]
    Signed-off-by: David Sterba <dsterba@suse.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/btrfs/Kconfig | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
    index 68b95ad82126..520a0f6a7d9e 100644
    --- a/fs/btrfs/Kconfig
    +++ b/fs/btrfs/Kconfig
    @@ -18,6 +18,8 @@ config BTRFS_FS
    select RAID6_PQ
    select XOR_BLOCKS
    select SRCU
    + depends on !PPC_256K_PAGES # powerpc
    + depends on !PAGE_SIZE_256KB # hexagon

    help
    Btrfs is a general purpose copy-on-write filesystem with extents,
    --
    2.30.2


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