| From 71de3f6cf91d90c1c127944097550731cddb1ace Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Thu, 10 Jun 2021 05:23:02 +0000 |
| Subject: btrfs: disable build on platforms having page size 256K |
| |
| 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 |
| |