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mm, thp: remove infrastructure for handling splitting PMDs
With new refcounting we don't need to mark PMDs splitting. Let's drop code to handle this. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Jerome Marchand <jmarchan@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Steve Capper <steve.capper@linaro.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
Linus Torvalds
parent
1f19617d77
commit
4b471e8898
@ -1,40 +0,0 @@
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#
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# Feature name: pmdp_splitting_flush
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# Kconfig: __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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# description: arch supports the pmdp_splitting_flush() VM API
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#
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-----------------------
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| arch |status|
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-----------------------
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| alpha: | TODO |
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| arc: | TODO |
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| arm: | ok |
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| arm64: | ok |
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| avr32: | TODO |
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| blackfin: | TODO |
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| c6x: | TODO |
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| cris: | TODO |
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| frv: | TODO |
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| h8300: | TODO |
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| hexagon: | TODO |
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| ia64: | TODO |
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| m32r: | TODO |
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| m68k: | TODO |
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| metag: | TODO |
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| microblaze: | TODO |
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| mips: | ok |
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| mn10300: | TODO |
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| nios2: | TODO |
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| openrisc: | TODO |
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| parisc: | TODO |
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| powerpc: | ok |
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| s390: | ok |
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| score: | TODO |
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| sh: | TODO |
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| sparc: | TODO |
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| tile: | TODO |
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| um: | TODO |
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| unicore32: | TODO |
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| x86: | ok |
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| xtensa: | TODO |
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-----------------------
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@ -602,7 +602,7 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
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pte_t *pte;
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spinlock_t *ptl;
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if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
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if (pmd_trans_huge_lock(pmd, vma, &ptl)) {
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smaps_pmd_entry(pmd, addr, walk);
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spin_unlock(ptl);
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return 0;
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@ -913,7 +913,7 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
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spinlock_t *ptl;
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struct page *page;
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if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
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if (pmd_trans_huge_lock(pmd, vma, &ptl)) {
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if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
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clear_soft_dirty_pmd(vma, addr, pmd);
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goto out;
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@ -1187,7 +1187,7 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
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int err = 0;
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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if (pmd_trans_huge_lock(pmdp, vma, &ptl) == 1) {
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if (pmd_trans_huge_lock(pmdp, vma, &ptl)) {
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u64 flags = 0, frame = 0;
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pmd_t pmd = *pmdp;
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@ -1519,7 +1519,7 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
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pte_t *orig_pte;
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pte_t *pte;
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if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
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if (pmd_trans_huge_lock(pmd, vma, &ptl)) {
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pte_t huge_pte = *(pte_t *)pmd;
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struct page *page;
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@ -207,11 +207,6 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif
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#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
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extern void pmdp_splitting_flush(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp);
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#endif
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#ifndef pmdp_collapse_flush
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
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@ -627,10 +622,6 @@ static inline int pmd_trans_huge(pmd_t pmd)
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{
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return 0;
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}
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static inline int pmd_trans_splitting(pmd_t pmd)
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{
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return 0;
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}
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#ifndef __HAVE_ARCH_PMD_WRITE
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static inline int pmd_write(pmd_t pmd)
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{
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@ -25,7 +25,7 @@ extern int zap_huge_pmd(struct mmu_gather *tlb,
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extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr, unsigned long end,
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unsigned char *vec);
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extern int move_huge_pmd(struct vm_area_struct *vma,
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extern bool move_huge_pmd(struct vm_area_struct *vma,
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struct vm_area_struct *new_vma,
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unsigned long old_addr,
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unsigned long new_addr, unsigned long old_end,
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@ -48,15 +48,9 @@ enum transparent_hugepage_flag {
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#endif
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};
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enum page_check_address_pmd_flag {
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PAGE_CHECK_ADDRESS_PMD_FLAG,
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PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
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PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
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};
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extern pmd_t *page_check_address_pmd(struct page *page,
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struct mm_struct *mm,
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unsigned long address,
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enum page_check_address_pmd_flag flag,
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spinlock_t **ptl);
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#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
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@ -100,7 +94,6 @@ extern unsigned long transparent_hugepage_flags;
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#define split_huge_page(page) BUILD_BUG()
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#define split_huge_pmd(__vma, __pmd, __address) BUILD_BUG()
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#define wait_split_huge_page(__anon_vma, __pmd) BUILD_BUG()
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#if HPAGE_PMD_ORDER >= MAX_ORDER
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#error "hugepages can't be allocated by the buddy allocator"
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#endif
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@ -110,17 +103,17 @@ extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
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unsigned long start,
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unsigned long end,
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long adjust_next);
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extern int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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extern bool __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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spinlock_t **ptl);
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/* mmap_sem must be held on entry */
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static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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spinlock_t **ptl)
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{
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VM_BUG_ON_VMA(!rwsem_is_locked(&vma->vm_mm->mmap_sem), vma);
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if (pmd_trans_huge(*pmd))
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return __pmd_trans_huge_lock(pmd, vma, ptl);
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else
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return 0;
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return false;
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}
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static inline int hpage_nr_pages(struct page *page)
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{
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@ -165,8 +158,6 @@ static inline int split_huge_page(struct page *page)
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{
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return 0;
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}
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#define wait_split_huge_page(__anon_vma, __pmd) \
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do { } while (0)
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#define split_huge_pmd(__vma, __pmd, __address) \
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do { } while (0)
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static inline int hugepage_madvise(struct vm_area_struct *vma,
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@ -181,10 +172,10 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
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long adjust_next)
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{
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}
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static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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static inline bool pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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spinlock_t **ptl)
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{
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return 0;
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return false;
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}
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static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
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12
mm/gup.c
12
mm/gup.c
@ -241,13 +241,6 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
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spin_unlock(ptl);
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return follow_page_pte(vma, address, pmd, flags);
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}
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if (unlikely(pmd_trans_splitting(*pmd))) {
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spin_unlock(ptl);
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wait_split_huge_page(vma->anon_vma, pmd);
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return follow_page_pte(vma, address, pmd, flags);
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}
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if (flags & FOLL_SPLIT) {
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int ret;
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page = pmd_page(*pmd);
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@ -1068,9 +1061,6 @@ struct page *get_dump_page(unsigned long addr)
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* *) HAVE_RCU_TABLE_FREE is enabled, and tlb_remove_table is used to free
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* pages containing page tables.
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*
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* *) THP splits will broadcast an IPI, this can be achieved by overriding
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* pmdp_splitting_flush.
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*
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* *) ptes can be read atomically by the architecture.
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*
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* *) access_ok is sufficient to validate userspace address ranges.
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@ -1267,7 +1257,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end,
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pmd_t pmd = READ_ONCE(*pmdp);
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next = pmd_addr_end(addr, end);
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if (pmd_none(pmd) || pmd_trans_splitting(pmd))
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if (pmd_none(pmd))
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return 0;
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if (unlikely(pmd_trans_huge(pmd) || pmd_huge(pmd))) {
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@ -986,15 +986,6 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
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goto out_unlock;
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}
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if (unlikely(pmd_trans_splitting(pmd))) {
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/* split huge page running from under us */
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spin_unlock(src_ptl);
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spin_unlock(dst_ptl);
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pte_free(dst_mm, pgtable);
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wait_split_huge_page(vma->anon_vma, src_pmd); /* src_vma */
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goto out;
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}
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src_page = pmd_page(pmd);
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VM_BUG_ON_PAGE(!PageHead(src_page), src_page);
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get_page(src_page);
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@ -1470,7 +1461,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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pmd_t orig_pmd;
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spinlock_t *ptl;
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if (__pmd_trans_huge_lock(pmd, vma, &ptl) != 1)
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if (!__pmd_trans_huge_lock(pmd, vma, &ptl))
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return 0;
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/*
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* For architectures like ppc64 we look at deposited pgtable
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@ -1504,13 +1495,12 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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return 1;
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}
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int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
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bool move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
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unsigned long old_addr,
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unsigned long new_addr, unsigned long old_end,
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pmd_t *old_pmd, pmd_t *new_pmd)
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{
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spinlock_t *old_ptl, *new_ptl;
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int ret = 0;
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pmd_t pmd;
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struct mm_struct *mm = vma->vm_mm;
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@ -1519,7 +1509,7 @@ int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
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(new_addr & ~HPAGE_PMD_MASK) ||
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old_end - old_addr < HPAGE_PMD_SIZE ||
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(new_vma->vm_flags & VM_NOHUGEPAGE))
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goto out;
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return false;
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/*
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* The destination pmd shouldn't be established, free_pgtables()
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@ -1527,15 +1517,14 @@ int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
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*/
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if (WARN_ON(!pmd_none(*new_pmd))) {
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VM_BUG_ON(pmd_trans_huge(*new_pmd));
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goto out;
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return false;
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}
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/*
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* We don't have to worry about the ordering of src and dst
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* ptlocks because exclusive mmap_sem prevents deadlock.
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*/
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ret = __pmd_trans_huge_lock(old_pmd, vma, &old_ptl);
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if (ret == 1) {
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if (__pmd_trans_huge_lock(old_pmd, vma, &old_ptl)) {
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new_ptl = pmd_lockptr(mm, new_pmd);
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if (new_ptl != old_ptl)
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spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING);
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@ -1551,9 +1540,9 @@ int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
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if (new_ptl != old_ptl)
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spin_unlock(new_ptl);
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spin_unlock(old_ptl);
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return true;
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}
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out:
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return ret;
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return false;
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}
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/*
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@ -1569,7 +1558,7 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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spinlock_t *ptl;
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int ret = 0;
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if (__pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
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if (__pmd_trans_huge_lock(pmd, vma, &ptl)) {
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pmd_t entry;
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bool preserve_write = prot_numa && pmd_write(*pmd);
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ret = 1;
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@ -1600,29 +1589,19 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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}
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/*
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* Returns 1 if a given pmd maps a stable (not under splitting) thp.
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* Returns -1 if it maps a thp under splitting. Returns 0 otherwise.
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* Returns true if a given pmd maps a thp, false otherwise.
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*
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* Note that if it returns 1, this routine returns without unlocking page
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* table locks. So callers must unlock them.
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* Note that if it returns true, this routine returns without unlocking page
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* table lock. So callers must unlock it.
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*/
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int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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bool __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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spinlock_t **ptl)
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{
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*ptl = pmd_lock(vma->vm_mm, pmd);
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if (likely(pmd_trans_huge(*pmd))) {
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if (unlikely(pmd_trans_splitting(*pmd))) {
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spin_unlock(*ptl);
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wait_split_huge_page(vma->anon_vma, pmd);
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return -1;
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} else {
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/* Thp mapped by 'pmd' is stable, so we can
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* handle it as it is. */
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return 1;
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}
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}
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if (likely(pmd_trans_huge(*pmd)))
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return true;
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spin_unlock(*ptl);
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return 0;
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return false;
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}
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/*
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@ -1636,7 +1615,6 @@ int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
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pmd_t *page_check_address_pmd(struct page *page,
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struct mm_struct *mm,
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unsigned long address,
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enum page_check_address_pmd_flag flag,
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spinlock_t **ptl)
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{
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pgd_t *pgd;
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@ -1659,21 +1637,8 @@ pmd_t *page_check_address_pmd(struct page *page,
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goto unlock;
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if (pmd_page(*pmd) != page)
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goto unlock;
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/*
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* split_vma() may create temporary aliased mappings. There is
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* no risk as long as all huge pmd are found and have their
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* splitting bit set before __split_huge_page_refcount
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* runs. Finding the same huge pmd more than once during the
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* same rmap walk is not a problem.
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*/
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if (flag == PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG &&
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pmd_trans_splitting(*pmd))
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goto unlock;
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if (pmd_trans_huge(*pmd)) {
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VM_BUG_ON(flag == PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG &&
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!pmd_trans_splitting(*pmd));
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if (pmd_trans_huge(*pmd))
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return pmd;
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}
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unlock:
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spin_unlock(*ptl);
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return NULL;
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@ -4675,7 +4675,7 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd,
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pte_t *pte;
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spinlock_t *ptl;
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if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
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if (pmd_trans_huge_lock(pmd, vma, &ptl)) {
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if (get_mctgt_type_thp(vma, addr, *pmd, NULL) == MC_TARGET_PAGE)
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mc.precharge += HPAGE_PMD_NR;
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spin_unlock(ptl);
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@ -4863,16 +4863,7 @@ static int mem_cgroup_move_charge_pte_range(pmd_t *pmd,
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union mc_target target;
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struct page *page;
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/*
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||||
* No race with splitting thp happens because:
|
||||
* - if pmd_trans_huge_lock() returns 1, the relevant thp is not
|
||||
* under splitting, which means there's no concurrent thp split,
|
||||
* - if another thread runs into split_huge_page() just after we
|
||||
* entered this if-block, the thread must wait for page table lock
|
||||
* to be unlocked in __split_huge_page_splitting(), where the main
|
||||
* part of thp split is not executed yet.
|
||||
*/
|
||||
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
|
||||
if (pmd_trans_huge_lock(pmd, vma, &ptl)) {
|
||||
if (mc.precharge < HPAGE_PMD_NR) {
|
||||
spin_unlock(ptl);
|
||||
return 0;
|
||||
|
||||
18
mm/memory.c
18
mm/memory.c
@ -566,7 +566,6 @@ int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
{
|
||||
spinlock_t *ptl;
|
||||
pgtable_t new = pte_alloc_one(mm, address);
|
||||
int wait_split_huge_page;
|
||||
if (!new)
|
||||
return -ENOMEM;
|
||||
|
||||
@ -586,18 +585,14 @@ int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
smp_wmb(); /* Could be smp_wmb__xxx(before|after)_spin_lock */
|
||||
|
||||
ptl = pmd_lock(mm, pmd);
|
||||
wait_split_huge_page = 0;
|
||||
if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
|
||||
atomic_long_inc(&mm->nr_ptes);
|
||||
pmd_populate(mm, pmd, new);
|
||||
new = NULL;
|
||||
} else if (unlikely(pmd_trans_splitting(*pmd)))
|
||||
wait_split_huge_page = 1;
|
||||
}
|
||||
spin_unlock(ptl);
|
||||
if (new)
|
||||
pte_free(mm, new);
|
||||
if (wait_split_huge_page)
|
||||
wait_split_huge_page(vma->anon_vma, pmd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -613,8 +608,7 @@ int __pte_alloc_kernel(pmd_t *pmd, unsigned long address)
|
||||
if (likely(pmd_none(*pmd))) { /* Has another populated it ? */
|
||||
pmd_populate_kernel(&init_mm, pmd, new);
|
||||
new = NULL;
|
||||
} else
|
||||
VM_BUG_ON(pmd_trans_splitting(*pmd));
|
||||
}
|
||||
spin_unlock(&init_mm.page_table_lock);
|
||||
if (new)
|
||||
pte_free_kernel(&init_mm, new);
|
||||
@ -3374,14 +3368,6 @@ static int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
if (pmd_trans_huge(orig_pmd)) {
|
||||
unsigned int dirty = flags & FAULT_FLAG_WRITE;
|
||||
|
||||
/*
|
||||
* If the pmd is splitting, return and retry the
|
||||
* the fault. Alternative: wait until the split
|
||||
* is done, and goto retry.
|
||||
*/
|
||||
if (pmd_trans_splitting(orig_pmd))
|
||||
return 0;
|
||||
|
||||
if (pmd_protnone(orig_pmd))
|
||||
return do_huge_pmd_numa_page(mm, vma, address,
|
||||
orig_pmd, pmd);
|
||||
|
||||
@ -117,7 +117,7 @@ static int mincore_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
|
||||
unsigned char *vec = walk->private;
|
||||
int nr = (end - addr) >> PAGE_SHIFT;
|
||||
|
||||
if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
|
||||
if (pmd_trans_huge_lock(pmd, vma, &ptl)) {
|
||||
memset(vec, 1, nr);
|
||||
spin_unlock(ptl);
|
||||
goto out;
|
||||
|
||||
15
mm/mremap.c
15
mm/mremap.c
@ -192,25 +192,24 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
|
||||
if (!new_pmd)
|
||||
break;
|
||||
if (pmd_trans_huge(*old_pmd)) {
|
||||
int err = 0;
|
||||
if (extent == HPAGE_PMD_SIZE) {
|
||||
bool moved;
|
||||
VM_BUG_ON_VMA(vma->vm_file || !vma->anon_vma,
|
||||
vma);
|
||||
/* See comment in move_ptes() */
|
||||
if (need_rmap_locks)
|
||||
anon_vma_lock_write(vma->anon_vma);
|
||||
err = move_huge_pmd(vma, new_vma, old_addr,
|
||||
moved = move_huge_pmd(vma, new_vma, old_addr,
|
||||
new_addr, old_end,
|
||||
old_pmd, new_pmd);
|
||||
if (need_rmap_locks)
|
||||
anon_vma_unlock_write(vma->anon_vma);
|
||||
if (moved) {
|
||||
need_flush = true;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
if (err > 0) {
|
||||
need_flush = true;
|
||||
continue;
|
||||
} else if (!err) {
|
||||
split_huge_pmd(vma, old_pmd, old_addr);
|
||||
}
|
||||
split_huge_pmd(vma, old_pmd, old_addr);
|
||||
VM_BUG_ON(pmd_trans_huge(*old_pmd));
|
||||
}
|
||||
if (pmd_none(*new_pmd) && __pte_alloc(new_vma->vm_mm, new_vma,
|
||||
|
||||
@ -61,8 +61,7 @@ static int page_idle_clear_pte_refs_one(struct page *page,
|
||||
bool referenced = false;
|
||||
|
||||
if (unlikely(PageTransHuge(page))) {
|
||||
pmd = page_check_address_pmd(page, mm, addr,
|
||||
PAGE_CHECK_ADDRESS_PMD_FLAG, &ptl);
|
||||
pmd = page_check_address_pmd(page, mm, addr, &ptl);
|
||||
if (pmd) {
|
||||
referenced = pmdp_clear_young_notify(vma, addr, pmd);
|
||||
spin_unlock(ptl);
|
||||
|
||||
@ -139,18 +139,6 @@ pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
|
||||
void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
|
||||
pmd_t *pmdp)
|
||||
{
|
||||
pmd_t pmd = pmd_mksplitting(*pmdp);
|
||||
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
|
||||
set_pmd_at(vma->vm_mm, address, pmdp, pmd);
|
||||
/* tlb flush only to serialize against gup-fast */
|
||||
flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
|
||||
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
|
||||
pgtable_t pgtable)
|
||||
|
||||
@ -843,8 +843,7 @@ static int page_referenced_one(struct page *page, struct vm_area_struct *vma,
|
||||
* rmap might return false positives; we must filter
|
||||
* these out using page_check_address_pmd().
|
||||
*/
|
||||
pmd = page_check_address_pmd(page, mm, address,
|
||||
PAGE_CHECK_ADDRESS_PMD_FLAG, &ptl);
|
||||
pmd = page_check_address_pmd(page, mm, address, &ptl);
|
||||
if (!pmd)
|
||||
return SWAP_AGAIN;
|
||||
|
||||
@ -854,7 +853,6 @@ static int page_referenced_one(struct page *page, struct vm_area_struct *vma,
|
||||
return SWAP_FAIL; /* To break the loop */
|
||||
}
|
||||
|
||||
/* go ahead even if the pmd is pmd_trans_splitting() */
|
||||
if (pmdp_clear_flush_young_notify(vma, address, pmd))
|
||||
referenced++;
|
||||
spin_unlock(ptl);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user