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,