Now that the get_user_pages() path knows how to handle dax-pmd mappings,
remove the protections that disabled dax-pmd support.
Tests available from github.com/pmem/ndctl:
make TESTS="lib/test-dax.sh lib/test-mmap.sh" check
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
fs/Kconfig | 3 ++-
fs/dax.c | 8 ++------
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/fs/Kconfig b/fs/Kconfig
index 7a6ff07c183f..922893f8ab4a 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -50,7 +50,8 @@ config FS_DAX_PMD
bool
default FS_DAX
depends on FS_DAX
- depends on BROKEN
+ depends on ZONE_DEVICE
+ depends on TRANSPARENT_HUGEPAGE
endif # BLOCK
diff --git a/fs/dax.c b/fs/dax.c
index a8b82a75dfa8..dd11e15a7940 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -581,7 +581,7 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
sector_t block;
int result = 0;
- /* dax pmd mappings are broken wrt gup and fork */
+ /* dax pmd mappings require pfn_t_devmap() */
if (!IS_ENABLED(CONFIG_FS_DAX_PMD))
return VM_FAULT_FALLBACK;
@@ -706,11 +706,7 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
goto fallback;
}
- /*
- * TODO: teach vmf_insert_pfn_pmd() to support
- * 'pte_special' for pmds
- */
- if (pfn_t_has_page(dax.pfn)) {
+ if (!pfn_t_devmap(dax.pfn)) {
dax_unmap_atomic(bdev, &dax);
dax_pmd_dbg(bdev, address, "pfn not in memmap");
goto fallback;
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>