non_swap_entry() returns true if a given swp_entry_t is a migration
entry or hwpoisoned entry. So non_swap_entry() && is_migration_entry() is
identical with just is_migration_entry(). So by removing non_swap_entry(),
we can write is_hugetlb_entry_(migration|hwpoisoned)() more simply.
And the name is_hugetlb_entry_(migration|hwpoisoned) is lengthy and
it's not predictable from naming convention around pte_* family.
Just pte_migration() looks better, but these function contains hugetlb
specific (so architecture dependent) huge_pte_none() check, so let's
rename them as huge_pte_(migration|hwpoisoned).
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
mm/hugetlb.c | 38 +++++++++++++-------------------------
1 file changed, 13 insertions(+), 25 deletions(-)
diff --git mmotm-2014-11-26-15-45.orig/mm/hugetlb.c mmotm-2014-11-26-15-45/mm/hugetlb.c
index 6c38f9ad3d56..bc9cbdb4f58f 100644
--- mmotm-2014-11-26-15-45.orig/mm/hugetlb.c
+++ mmotm-2014-11-26-15-45/mm/hugetlb.c
@@ -2516,30 +2516,18 @@ static void set_huge_ptep_writable(struct vm_area_struct *vma,
update_mmu_cache(vma, address, ptep);
}
-static int is_hugetlb_entry_migration(pte_t pte)
+static inline int huge_pte_migration(pte_t pte)
{
- swp_entry_t swp;
-
if (huge_pte_none(pte) || pte_present(pte))
return 0;
- swp = pte_to_swp_entry(pte);
- if (non_swap_entry(swp) && is_migration_entry(swp))
- return 1;
- else
- return 0;
+ return is_migration_entry(pte_to_swp_entry(pte));
}
-static int is_hugetlb_entry_hwpoisoned(pte_t pte)
+static inline int huge_pte_hwpoisoned(pte_t pte)
{
- swp_entry_t swp;
-
if (huge_pte_none(pte) || pte_present(pte))
return 0;
- swp = pte_to_swp_entry(pte);
- if (non_swap_entry(swp) && is_hwpoison_entry(swp))
- return 1;
- else
- return 0;
+ return is_hwpoison_entry(pte_to_swp_entry(pte));
}
int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
@@ -2583,8 +2571,8 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
entry = huge_ptep_get(src_pte);
if (huge_pte_none(entry)) { /* skip none entry */
;
- } else if (unlikely(is_hugetlb_entry_migration(entry) ||
- is_hugetlb_entry_hwpoisoned(entry))) {
+ } else if (unlikely(huge_pte_migration(entry) ||
+ huge_pte_hwpoisoned(entry))) {
swp_entry_t swp_entry = pte_to_swp_entry(entry);
if (is_write_migration_entry(swp_entry) && cow) {
@@ -3169,9 +3157,9 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* a active hugepage in pagecache.
*/
if (!pte_present(entry)) {
- if (is_hugetlb_entry_migration(entry))
+ if (huge_pte_migration(entry))
need_wait_migration = 1;
- else if (is_hugetlb_entry_hwpoisoned(entry))
+ else if (huge_pte_hwpoisoned(entry))
ret = VM_FAULT_HWPOISON_LARGE |
VM_FAULT_SET_HINDEX(hstate_index(h));
goto out_mutex;
@@ -3303,8 +3291,8 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
* (in which case hugetlb_fault waits for the migration,) and
* hwpoisoned hugepages (in which case we need to prevent the
* caller from accessing to them.) In order to do this, we use
- * here is_swap_pte instead of is_hugetlb_entry_migration and
- * is_hugetlb_entry_hwpoisoned. This is because it simply covers
+ * here is_swap_pte instead of huge_pte_migration and
+ * huge_pte_hwpoisoned. This is because it simply covers
* both cases, and because we can't follow correct pages
* directly from any kind of swap entries.
*/
@@ -3382,11 +3370,11 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
continue;
}
pte = huge_ptep_get(ptep);
- if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
+ if (unlikely(huge_pte_hwpoisoned(pte))) {
spin_unlock(ptl);
continue;
}
- if (unlikely(is_hugetlb_entry_migration(pte))) {
+ if (unlikely(huge_pte_migration(pte))) {
swp_entry_t entry = pte_to_swp_entry(pte);
if (is_write_migration_entry(entry)) {
@@ -3730,7 +3718,7 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
if (flags & FOLL_GET)
get_page(page);
} else {
- if (is_hugetlb_entry_migration(huge_ptep_get((pte_t *)pmd))) {
+ if (huge_pte_migration(huge_ptep_get((pte_t *)pmd))) {
spin_unlock(ptl);
__migration_entry_wait(mm, (pte_t *)pmd, ptl);
goto retry;
--
2.2.0.rc0.2.gf745acb
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