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Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/dax.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index be376d91d058..baf41118660d 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt | |||
| @@ -82,6 +82,9 @@ Shortcomings | |||
| 82 | Even if the kernel or its modules are stored on a filesystem that supports | 82 | Even if the kernel or its modules are stored on a filesystem that supports |
| 83 | DAX on a block device that supports DAX, they will still be copied into RAM. | 83 | DAX on a block device that supports DAX, they will still be copied into RAM. |
| 84 | 84 | ||
| 85 | The DAX code does not work correctly on architectures which have virtually | ||
| 86 | mapped caches such as ARM, MIPS and SPARC. | ||
| 87 | |||
| 85 | Calling get_user_pages() on a range of user memory that has been mmaped | 88 | Calling get_user_pages() on a range of user memory that has been mmaped |
| 86 | from a DAX file will fail as there are no 'struct page' to describe | 89 | from a DAX file will fail as there are no 'struct page' to describe |
| 87 | those pages. This problem is being worked on. That means that O_DIRECT | 90 | those pages. This problem is being worked on. That means that O_DIRECT |