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authorMatthew Wilcox <matthew.r.wilcox@intel.com>2015-02-17 02:59:44 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-17 04:56:04 +0300
commitd92576f1167cacf7844e5993f343eed4a6d8a147 (patch)
tree59bac8408c6faff4adb2d32398cff07b2e122b6b /fs
parenta7a97fc9ff6c2fcec00feb34d9b87b94452b0b78 (diff)
downloadlinux-d92576f1167cacf7844e5993f343eed4a6d8a147.tar.xz
dax: does not work correctly with virtual aliasing caches
The DAX code accesses the underlying storage through the kernel's linear mapping, which may not be cache-coherent with user mappings on ARM, MIPS or SPARC. Temporarily disable the DAX code until this problem is resolved. The original XIP code also had this problem, but it was never noticed. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Cc: Andreas Dilger <andreas.dilger@intel.com> Cc: Boaz Harrosh <boaz@plexistor.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/Kconfig b/fs/Kconfig
index 5331497d5b25..ec35851e5b71 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -36,6 +36,7 @@ source "fs/nilfs2/Kconfig"
config FS_DAX
bool "Direct Access (DAX) support"
depends on MMU
+ depends on !(ARM || MIPS || SPARC)
help
Direct Access (DAX) can be used on memory-backed block devices.
If the block device supports DAX and the filesystem supports DAX,