linux-kernel - [PATCH v2 6/7] mm/hmm: remove hugetlbfs check in hmm_vma_walk

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Message-ID: <20190726005650.2566-7-rcampbell@nvidia.com>
Date:   Thu, 25 Jul 2019 17:56:49 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     <linux-mm@...ck.org>
CC:     <linux-kernel@...r.kernel.org>, <amd-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <nouveau@...ts.freedesktop.org>,
        "Ralph Campbell" <rcampbell@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH v2 6/7] mm/hmm: remove hugetlbfs check in hmm_vma_walk_pmd

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().

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
Cc: "Jérôme Glisse" <jglisse@...hat.com>
Cc: Jason Gunthorpe <jgg@...lanox.com>
Cc: Christoph Hellwig <hch@....de>
---
 mm/hmm.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 838cd1d50497..29f322ca5d58 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -630,9 +630,6 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
 	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;
-- 
2.20.1