From: Wei Yang <richardw.yang@linux.intel.com>
To: viro@zeniv.linux.org.uk
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Wei Yang <richardw.yang@linux.intel.com>
Subject: [PATCH 3/3] fs/userfaultfd.c: wrap cheching huge page alignment into a helper
Date: Fri, 13 Sep 2019 05:31:10 +0800 [thread overview]
Message-ID: <20190912213110.3691-3-richardw.yang@linux.intel.com> (raw)
In-Reply-To: <20190912213110.3691-1-richardw.yang@linux.intel.com>
There are three places checking whether one address is huge page
aligned.
This patch just makes a helper function to wrap it up.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
---
fs/userfaultfd.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 70c0e0ef01d7..d8665ffdd576 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -1296,6 +1296,16 @@ static inline bool vma_can_userfault(struct vm_area_struct *vma)
vma_is_shmem(vma);
}
+static inline bool addr_huge_page_aligned(unsigned long addr,
+ struct vm_area_struct *vma)
+{
+ unsigned long vma_hpagesize = vma_kernel_pagesize(vma);
+
+ if (addr & (vma_hpagesize - 1))
+ return false;
+ return true;
+}
+
static int userfaultfd_register(struct userfaultfd_ctx *ctx,
unsigned long arg)
{
@@ -1363,12 +1373,8 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
* If the first vma contains huge pages, make sure start address
* is aligned to huge page size.
*/
- if (is_vm_hugetlb_page(vma)) {
- unsigned long vma_hpagesize = vma_kernel_pagesize(vma);
-
- if (start & (vma_hpagesize - 1))
- goto out_unlock;
- }
+ if (is_vm_hugetlb_page(vma) && !addr_huge_page_aligned(start, vma))
+ goto out_unlock;
/*
* Search for not compatible vmas.
@@ -1403,11 +1409,9 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
* check alignment.
*/
if (end <= cur->vm_end && is_vm_hugetlb_page(cur)) {
- unsigned long vma_hpagesize = vma_kernel_pagesize(cur);
-
ret = -EINVAL;
- if (end & (vma_hpagesize - 1))
+ if (!addr_huge_page_aligned(end, cur))
goto out_unlock;
}
@@ -1551,12 +1555,8 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
* If the first vma contains huge pages, make sure start address
* is aligned to huge page size.
*/
- if (is_vm_hugetlb_page(vma)) {
- unsigned long vma_hpagesize = vma_kernel_pagesize(vma);
-
- if (start & (vma_hpagesize - 1))
- goto out_unlock;
- }
+ if (is_vm_hugetlb_page(vma) && !addr_huge_page_aligned(start, vma))
+ goto out_unlock;
/*
* Search for not compatible vmas.
--
2.17.1
next prev parent reply other threads:[~2019-09-12 21:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 21:31 [PATCH 1/3] fs/userfaultfd.c: remove a redundant check on end Wei Yang
2019-09-12 21:31 ` [PATCH 2/3] fs/userfaultfd.c: reorder the if check to reduce some computation Wei Yang
2019-09-12 21:31 ` Wei Yang [this message]
2019-10-12 9:16 ` [PATCH 1/3] fs/userfaultfd.c: remove a redundant check on end Wei Yang
2019-11-09 1:29 ` Wei Yang
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