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-rw-r--r--mm/hugetlb.c58
1 files changed, 45 insertions, 13 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index a2d29b8..3e873f0 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -40,6 +40,28 @@ static int hugetlb_next_nid;
*/
static DEFINE_SPINLOCK(hugetlb_lock);
+/*
+ * Convert the address within this vma to the page offset within
+ * the mapping, in base page units.
+ */
+static pgoff_t vma_page_offset(struct vm_area_struct *vma,
+ unsigned long address)
+{
+ return ((address - vma->vm_start) >> PAGE_SHIFT) +
+ (vma->vm_pgoff >> PAGE_SHIFT);
+}
+
+/*
+ * Convert the address within this vma to the page offset within
+ * the mapping, in pagecache page units; huge pages here.
+ */
+static pgoff_t vma_pagecache_offset(struct vm_area_struct *vma,
+ unsigned long address)
+{
+ return ((address - vma->vm_start) >> HPAGE_SHIFT) +
+ (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
+}
+
#define HPAGE_RESV_OWNER (1UL << (BITS_PER_LONG - 1))
#define HPAGE_RESV_UNMAPPED (1UL << (BITS_PER_LONG - 2))
#define HPAGE_RESV_MASK (HPAGE_RESV_OWNER | HPAGE_RESV_UNMAPPED)
@@ -53,36 +75,48 @@ static DEFINE_SPINLOCK(hugetlb_lock);
* to reset the VMA at fork() time as it is not in use yet and there is no
* chance of the global counters getting corrupted as a result of the values.
*/
+static unsigned long get_vma_private_data(struct vm_area_struct *vma)
+{
+ return (unsigned long)vma->vm_private_data;
+}
+
+static void set_vma_private_data(struct vm_area_struct *vma,
+ unsigned long value)
+{
+ vma->vm_private_data = (void *)value;
+}
+
static unsigned long vma_resv_huge_pages(struct vm_area_struct *vma)
{
VM_BUG_ON(!is_vm_hugetlb_page(vma));
if (!(vma->vm_flags & VM_SHARED))
- return (unsigned long)vma->vm_private_data & ~HPAGE_RESV_MASK;
+ return get_vma_private_data(vma) & ~HPAGE_RESV_MASK;
return 0;
}
static void set_vma_resv_huge_pages(struct vm_area_struct *vma,
unsigned long reserve)
{
- unsigned long flags;
VM_BUG_ON(!is_vm_hugetlb_page(vma));
VM_BUG_ON(vma->vm_flags & VM_SHARED);
- flags = (unsigned long)vma->vm_private_data & HPAGE_RESV_MASK;
- vma->vm_private_data = (void *)(reserve | flags);
+ set_vma_private_data(vma,
+ (get_vma_private_data(vma) & HPAGE_RESV_MASK) | reserve);
}
static void set_vma_resv_flags(struct vm_area_struct *vma, unsigned long flags)
{
- unsigned long reserveflags = (unsigned long)vma->vm_private_data;
VM_BUG_ON(!is_vm_hugetlb_page(vma));
- vma->vm_private_data = (void *)(reserveflags | flags);
+ VM_BUG_ON(vma->vm_flags & VM_SHARED);
+
+ set_vma_private_data(vma, get_vma_private_data(vma) | flags);
}
static int is_vma_resv_set(struct vm_area_struct *vma, unsigned long flag)
{
VM_BUG_ON(!is_vm_hugetlb_page(vma));
- return ((unsigned long)vma->vm_private_data & flag) != 0;
+
+ return (get_vma_private_data(vma) & flag) != 0;
}
/* Decrement the reserved pages in the hugepage pool by one */
@@ -1151,11 +1185,10 @@ static struct page *hugetlbfs_pagecache_page(struct vm_area_struct *vma,
unsigned long address)
{
struct address_space *mapping;
- unsigned long idx;
+ pgoff_t idx;
mapping = vma->vm_file->f_mapping;
- idx = ((address - vma->vm_start) >> HPAGE_SHIFT)
- + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
+ idx = vma_pagecache_offset(vma, address);
return find_lock_page(mapping, idx);
}
@@ -1164,7 +1197,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *ptep, int write_access)
{
int ret = VM_FAULT_SIGBUS;
- unsigned long idx;
+ pgoff_t idx;
unsigned long size;
struct page *page;
struct address_space *mapping;
@@ -1183,8 +1216,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
}
mapping = vma->vm_file->f_mapping;
- idx = ((address - vma->vm_start) >> HPAGE_SHIFT)
- + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
+ idx = vma_pagecache_offset(vma, address);
/*
* Use page lock to guard against racing truncation
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