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| author | Dan Williams <dan.j.williams@intel.com> | 2016-01-15 16:57:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 17:56:32 -0800 |
| commit | c046c321cb4a0bdac9fb922db3859893ca556d27 (patch) | |
| tree | 0765c98adba09720480e9639ec4c51eab442c95d | |
| parent | cbb38e41a931aaae5b2fef3b1c74d0d6f866b698 (diff) | |
| download | linux-stable-c046c321cb4a0bdac9fb922db3859893ca556d27.tar.gz linux-stable-c046c321cb4a0bdac9fb922db3859893ca556d27.tar.bz2 linux-stable-c046c321cb4a0bdac9fb922db3859893ca556d27.zip | |
dax: re-enable dax pmd mappings
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@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/Kconfig | 3 | ||||
| -rw-r--r-- | fs/dax.c | 8 |
2 files changed, 4 insertions, 7 deletions
diff --git a/fs/Kconfig b/fs/Kconfig index 2bb1ef86c411..9adee0d7536e 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 @@ -592,7 +592,7 @@ 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; @@ -717,11 +717,7 @@ 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(&bh, address, "pfn not in memmap"); goto fallback; |