Use dax_is_supported() to validate whether the architecture has
virtually aliased caches at mount time.
This is relevant for architectures which require a dynamic check
to validate whether they have virtually aliased data caches
(ARCH_HAS_CACHE_ALIASING_DYNAMIC=y).
Fixes: d92576f1167c ("dax: does not work correctly with virtual aliasing caches")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Chandan Babu R <chandan.babu@xxxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Cc: linux-xfs@xxxxxxxxxxxxxxx
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: nvdimm@xxxxxxxxxxxxxxx
Cc: linux-cxl@xxxxxxxxxxxxxxx
---
fs/xfs/xfs_super.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 764304595e8b..b27ecb11db66 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1376,14 +1376,22 @@ xfs_fs_parse_param(
case Opt_nodiscard:
parsing_mp->m_features &= ~XFS_FEAT_DISCARD;
return 0;
-#ifdef CONFIG_FS_DAX
case Opt_dax:
- xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
- return 0;
+ if (dax_is_supported()) {
+ xfs_mount_set_dax_mode(parsing_mp, XFS_DAX_ALWAYS);
+ return 0;
+ } else {
+ xfs_warn(parsing_mp, "dax option not supported.");
+ return -EINVAL;
+ }
case Opt_dax_enum:
- xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
- return 0;
-#endif
+ if (dax_is_supported()) {
+ xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
+ return 0;
+ } else {
+ xfs_warn(parsing_mp, "dax option not supported.");
+ return -EINVAL;
+ }
/* Following mount options will be removed in September 2025 */
case Opt_ikeep:
xfs_fs_warn_deprecated(fc, param, XFS_FEAT_IKEEP, true);
--
2.39.2
