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authorJason Gunthorpe <jgg@mellanox.com>2020-03-11 17:03:33 -0300
committerJason Gunthorpe <jgg@mellanox.com>2020-03-26 14:33:37 -0300
commit24cee8ab41eec51ea4cabd19c311719038084648 (patch)
tree1dc883b8ec8c9a807304fdb76ccaf15937fdc47c /mm/hmm.c
parent4055062749229101365e5f9e87cb1c5a93e292f8 (diff)
downloadlinux-24cee8ab41eec51ea4cabd19c311719038084648.tar.bz2
mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd()
pmd_to_hmm_pfn_flags() already checks it and makes the cpu flags 0. If no fault is requested then the pfns should be returned with the not valid flags. It should not unconditionally fault if faulting is not requested. Fixes: 2aee09d8c116 ("mm/hmm: change hmm_vma_fault() to allow write fault on page basis") Reviewed-by: Ralph Campbell <rcampbell@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'mm/hmm.c')
-rw-r--r--mm/hmm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index 9c82ea972d4b..37a6fca7da43 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -226,7 +226,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
hmm_range_need_fault(hmm_vma_walk, pfns, npages, cpu_flags,
&fault, &write_fault);
- if (pmd_protnone(pmd) || fault || write_fault)
+ if (fault || write_fault)
return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);