From: Ralph Campbell <rcampbell@nvidia.com>
Date: Thu, 25 Jul 2019 17:56:49 -0700
Subject: mm/hmm: remove hugetlbfs check in hmm_vma_walk_pmd
Patch-mainline: v5.4-rc1
Git-commit: f527688d5d8a80d2d1b2c02779105747c2f4f705
References: jsc#SLE-15176, jsc#SLE-16387

walk_page_range() will only call hmm_vma_walk_hugetlb_entry() for
hugetlbfs pages and doesn't call hmm_vma_walk_pmd() in this case.

Therefore, it is safe to remove the check for vma->vm_flags & VM_HUGETLB
in hmm_vma_walk_pmd().

Link: https://lore.kernel.org/r/20190726005650.2566-7-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 mm/hmm.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -630,9 +630,6 @@ again:
 	if (pmd_none(pmd))
 		return hmm_vma_walk_hole(start, end, walk);
 
-	if (pmd_huge(pmd) && (range->vma->vm_flags & VM_HUGETLB))
-		return hmm_pfns_bad(start, end, walk);
-
 	if (thp_migration_supported() && is_pmd_migration_entry(pmd)) {
 		bool fault, write_fault;
 		unsigned long npages;