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* [patch 145/158] userfaultfd: use vma_pagesize for all huge page size calculation
@ 2019-12-01  1:57 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2019-12-01  1:57 UTC (permalink / raw)
  To: aarcange, akpm, hughd, linux-mm, mike.kravetz, mm-commits,
	richardw.yang, torvalds

From: Wei Yang <richardw.yang@linux.intel.com>
Subject: userfaultfd: use vma_pagesize for all huge page size calculation

In __mcopy_atomic_hugetlb() we use two variables to deal with huge page
size: vma_hpagesize and huge_page_size.

Since they are the same, it is not necessary to use two different
mechanism. This patch makes it consistent by all using vma_hpagesize.

Link: http://lkml.kernel.org/r/20190927070032.2129-1-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/userfaultfd.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/mm/userfaultfd.c~userfaultfd-use-vma_pagesize-for-all-huge-page-size-calculation
+++ a/mm/userfaultfd.c
@@ -259,7 +259,7 @@ retry:
 		pte_t dst_pteval;
 
 		BUG_ON(dst_addr >= dst_start + len);
-		VM_BUG_ON(dst_addr & ~huge_page_mask(h));
+		VM_BUG_ON(dst_addr & (vma_hpagesize - 1));
 
 		/*
 		 * Serialize via hugetlb_fault_mutex
@@ -270,7 +270,7 @@ retry:
 		mutex_lock(&hugetlb_fault_mutex_table[hash]);
 
 		err = -ENOMEM;
-		dst_pte = huge_pte_alloc(dst_mm, dst_addr, huge_page_size(h));
+		dst_pte = huge_pte_alloc(dst_mm, dst_addr, vma_hpagesize);
 		if (!dst_pte) {
 			mutex_unlock(&hugetlb_fault_mutex_table[hash]);
 			goto out_unlock;
@@ -297,7 +297,8 @@ retry:
 
 			err = copy_huge_page_from_user(page,
 						(const void __user *)src_addr,
-						pages_per_huge_page(h), true);
+						vma_hpagesize / PAGE_SIZE,
+						true);
 			if (unlikely(err)) {
 				err = -EFAULT;
 				goto out;
_


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2019-12-01  1:57 [patch 145/158] userfaultfd: use vma_pagesize for all huge page size calculation akpm

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