linux-kernel - [PATCH] fs: btrfs: Disable BTRFS on platforms having 256K pages

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Message-Id: <a16c31f3caf448dda5d9315e056585b6fafc22c5.1623302442.git.christophe.leroy@csgroup.eu>
Date:   Thu, 10 Jun 2021 05:23:02 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-btrfs@...r.kernel.org, linux-hexagon@...r.kernel.org
Subject: [PATCH] fs: btrfs: Disable BTRFS on platforms having 256K pages

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.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 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,
-- 
2.25.0