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author | Otavio Salvador <otavio@ossystems.com.br> | 2018-06-08 10:09:28 -0300 |
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committer | GitHub <noreply@github.com> | 2018-06-08 10:09:28 -0300 |
commit | 5b5a04065fb5487303869fd6080c30f86530005d (patch) | |
tree | d1442504baf73be22d9e6bc1864206df5ccedfeb /mm/frame_vector.c | |
parent | 0e674a64b86e2bb00ab43f56104d3ea85dda0066 (diff) | |
parent | 8d99753ad93af6bcaf798232eeb15e60bdd7e94b (diff) |
Merge pull request #25 from MaxKrummenacher/4.9-1.0.x-imx-stable-merge
4.9 1.0.x imx stable merge
Diffstat (limited to 'mm/frame_vector.c')
-rw-r--r-- | mm/frame_vector.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/frame_vector.c b/mm/frame_vector.c index db77dcb38afd..375a103d7a56 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -52,6 +52,18 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, ret = -EFAULT; goto out; } + + /* + * While get_vaddr_frames() could be used for transient (kernel + * controlled lifetime) pinning of memory pages all current + * users establish long term (userspace controlled lifetime) + * page pinning. Treat get_vaddr_frames() like + * get_user_pages_longterm() and disallow it for filesystem-dax + * mappings. + */ + if (vma_is_fsdax(vma)) + return -EOPNOTSUPP; + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { vec->got_ref = true; vec->is_pfns = false; |