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| author | Toshi Kani <[email protected]> | 2016-01-16 00:56:05 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2016-01-16 01:56:32 +0000 |
| commit | 59bf4fb9d386601cbaa70a9b00159abb846dedaa (patch) | |
| tree | 0735bb6400f6ed0a3c3be69e1e10018a17fe6a63 /drivers/gpu/drm/omapdrm/omap_gem.c | |
| parent | mm, dax: fix livelock, allow dax pmd mappings to become writeable (diff) | |
| download | kernel-59bf4fb9d386601cbaa70a9b00159abb846dedaa.tar.gz kernel-59bf4fb9d386601cbaa70a9b00159abb846dedaa.zip | |
dax: Split pmd map when fallback on COW
An infinite loop of PMD faults was observed when attempted to mlock() a
private read-only PMD mmap'd range of a DAX file.
__dax_pmd_fault() simply returns with VM_FAULT_FALLBACK when falling
back to PTE on COW. However, __handle_mm_fault() returns without
falling back to handle_pte_fault() because a PMD map is present in this
case.
Change __dax_pmd_fault() to split the PMD map, if present, before
returning with VM_FAULT_FALLBACK.
Signed-off-by: Toshi Kani <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Ross Zwisler <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_gem.c')
0 files changed, 0 insertions, 0 deletions