linux-kernel - [PATCH 08/15] mm: remove the mask variable in hmm_vma_walk_hugetlb

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Message-Id: <20190806160554.14046-9-hch@lst.de>
Date:   Tue,  6 Aug 2019 19:05:46 +0300
From:   Christoph Hellwig <hch@....de>
To:     Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>
Cc:     Ralph Campbell <rcampbell@...dia.com>, linux-mm@...ck.org,
        nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/15] mm: remove the mask variable in hmm_vma_walk_hugetlb_entry

The pagewalk code already passes the value as the hmask parameter.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 mm/hmm.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index f26d6abc4ed2..03d37e102e3b 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -771,19 +771,16 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
 				      struct mm_walk *walk)
 {
 #ifdef CONFIG_HUGETLB_PAGE
-	unsigned long addr = start, i, pfn, mask;
+	unsigned long addr = start, i, pfn;
 	struct hmm_vma_walk *hmm_vma_walk = walk->private;
 	struct hmm_range *range = hmm_vma_walk->range;
 	struct vm_area_struct *vma = walk->vma;
-	struct hstate *h = hstate_vma(vma);
 	uint64_t orig_pfn, cpu_flags;
 	bool fault, write_fault;
 	spinlock_t *ptl;
 	pte_t entry;
 	int ret = 0;
 
-	mask = huge_page_size(h) - 1;
-
 	ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte);
 	entry = huge_ptep_get(pte);
 
@@ -799,7 +796,7 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
 		goto unlock;
 	}
 
-	pfn = pte_pfn(entry) + ((start & mask) >> PAGE_SHIFT);
+	pfn = pte_pfn(entry) + ((start & ~hmask) >> PAGE_SHIFT);
 	for (; addr < end; addr += PAGE_SIZE, i++, pfn++)
 		range->pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
 				 cpu_flags;
-- 
2.20.1