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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-06-10 05:23:02 +0000 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-06-22 14:11:57 +0200 |
| commit | b05fbcc36be1f8597a1febef4892053a0b2f3f60 (patch) | |
| tree | c6583d85468e38e0999b3d2a9f9c99d26760741f /fs/btrfs/Kconfig | |
| parent | d8ac76cdd1755b21e8c008c28d0b7251c0b14986 (diff) | |
| download | lwn-b05fbcc36be1f8597a1febef4892053a0b2f3f60.tar.gz lwn-b05fbcc36be1f8597a1febef4892053a0b2f3f60.zip | |
btrfs: disable build on platforms having page size 256K
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>
Diffstat (limited to 'fs/btrfs/Kconfig')
| -rw-r--r-- | fs/btrfs/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
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, |