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s390/mm: implement dirty bits for large segment table entries
The large segment table entry format has block of bits for the ACC/F values for the large page. These bits are valid only if another bit (AV bit 0x10000) of the segment table entry is set. The ACC/F bits do not have a meaning if the AV bit is off. This allows to put the THP splitting bit, the segment young bit and the new segment dirty bit into the ACC/F bits as long as the AV bit stays off. The dirty and young information is only available if the pmd is large. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
parent
55e4283c3e
commit
152125b7a8
@ -287,7 +287,14 @@ extern unsigned long MODULES_END;
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#define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */
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#define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */
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#define _SEGMENT_ENTRY_PTL 0x0f /* page table length */
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#define _SEGMENT_ENTRY_NONE _SEGMENT_ENTRY_PROTECT
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#define _SEGMENT_ENTRY_DIRTY 0 /* No sw dirty bit for 31-bit */
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#define _SEGMENT_ENTRY_YOUNG 0 /* No sw young bit for 31-bit */
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#define _SEGMENT_ENTRY_READ 0 /* No sw read bit for 31-bit */
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#define _SEGMENT_ENTRY_WRITE 0 /* No sw write bit for 31-bit */
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#define _SEGMENT_ENTRY_LARGE 0 /* No large pages for 31-bit */
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#define _SEGMENT_ENTRY_BITS_LARGE 0
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#define _SEGMENT_ENTRY_ORIGIN_LARGE 0
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#define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL)
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#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID)
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@ -350,7 +357,7 @@ extern unsigned long MODULES_END;
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/* Bits in the segment table entry */
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#define _SEGMENT_ENTRY_BITS 0xfffffffffffffe33UL
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#define _SEGMENT_ENTRY_BITS_LARGE 0xfffffffffff1ff33UL
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#define _SEGMENT_ENTRY_BITS_LARGE 0xfffffffffff0ff33UL
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#define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address */
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#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
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#define _SEGMENT_ENTRY_PROTECT 0x200 /* page protection bit */
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@ -359,30 +366,34 @@ extern unsigned long MODULES_END;
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#define _SEGMENT_ENTRY (0)
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#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID)
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#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
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#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
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#define _SEGMENT_ENTRY_SPLIT 0x001 /* THP splitting bit */
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#define _SEGMENT_ENTRY_YOUNG 0x002 /* SW segment young bit */
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#define _SEGMENT_ENTRY_NONE _SEGMENT_ENTRY_YOUNG
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#define _SEGMENT_ENTRY_DIRTY 0x2000 /* SW segment dirty bit */
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#define _SEGMENT_ENTRY_YOUNG 0x1000 /* SW segment young bit */
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#define _SEGMENT_ENTRY_SPLIT 0x0800 /* THP splitting bit */
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#define _SEGMENT_ENTRY_LARGE 0x0400 /* STE-format control, large page */
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#define _SEGMENT_ENTRY_CO 0x0100 /* change-recording override */
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#define _SEGMENT_ENTRY_READ 0x0002 /* SW segment read bit */
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#define _SEGMENT_ENTRY_WRITE 0x0001 /* SW segment write bit */
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/*
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* Segment table entry encoding (R = read-only, I = invalid, y = young bit):
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* ..R...I...y.
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* prot-none, old ..0...1...1.
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* prot-none, young ..1...1...1.
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* read-only, old ..1...1...0.
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* read-only, young ..1...0...1.
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* read-write, old ..0...1...0.
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* read-write, young ..0...0...1.
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* dy..R...I...wr
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* prot-none, clean, old 00..1...1...00
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* prot-none, clean, young 01..1...1...00
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* prot-none, dirty, old 10..1...1...00
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* prot-none, dirty, young 11..1...1...00
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* read-only, clean, old 00..1...1...01
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* read-only, clean, young 01..1...0...01
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* read-only, dirty, old 10..1...1...01
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* read-only, dirty, young 11..1...0...01
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* read-write, clean, old 00..1...1...11
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* read-write, clean, young 01..1...0...11
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* read-write, dirty, old 10..0...1...11
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* read-write, dirty, young 11..0...0...11
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* The segment table origin is used to distinguish empty (origin==0) from
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* read-write, old segment table entries (origin!=0)
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*/
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#define _SEGMENT_ENTRY_SPLIT_BIT 0 /* THP splitting bit number */
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/* Set of bits not changed in pmd_modify */
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#define _SEGMENT_CHG_MASK (_SEGMENT_ENTRY_ORIGIN | _SEGMENT_ENTRY_LARGE \
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| _SEGMENT_ENTRY_SPLIT | _SEGMENT_ENTRY_CO)
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#define _SEGMENT_ENTRY_SPLIT_BIT 11 /* THP splitting bit number */
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/* Page status table bits for virtualization */
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#define PGSTE_ACC_BITS 0xf000000000000000UL
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@ -455,10 +466,11 @@ extern unsigned long MODULES_END;
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* Segment entry (large page) protection definitions.
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*/
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#define SEGMENT_NONE __pgprot(_SEGMENT_ENTRY_INVALID | \
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_SEGMENT_ENTRY_NONE)
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#define SEGMENT_READ __pgprot(_SEGMENT_ENTRY_INVALID | \
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_SEGMENT_ENTRY_PROTECT)
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#define SEGMENT_WRITE __pgprot(_SEGMENT_ENTRY_INVALID)
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#define SEGMENT_READ __pgprot(_SEGMENT_ENTRY_PROTECT | \
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_SEGMENT_ENTRY_READ)
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#define SEGMENT_WRITE __pgprot(_SEGMENT_ENTRY_READ | \
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_SEGMENT_ENTRY_WRITE)
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static inline int mm_has_pgste(struct mm_struct *mm)
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{
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@ -569,25 +581,23 @@ static inline int pmd_none(pmd_t pmd)
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static inline int pmd_large(pmd_t pmd)
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{
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#ifdef CONFIG_64BIT
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return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0;
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#else
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return 0;
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#endif
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}
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static inline int pmd_prot_none(pmd_t pmd)
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static inline int pmd_pfn(pmd_t pmd)
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{
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return (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) &&
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(pmd_val(pmd) & _SEGMENT_ENTRY_NONE);
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unsigned long origin_mask;
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origin_mask = _SEGMENT_ENTRY_ORIGIN;
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if (pmd_large(pmd))
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origin_mask = _SEGMENT_ENTRY_ORIGIN_LARGE;
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return (pmd_val(pmd) & origin_mask) >> PAGE_SHIFT;
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}
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static inline int pmd_bad(pmd_t pmd)
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{
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#ifdef CONFIG_64BIT
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if (pmd_large(pmd))
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return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS_LARGE) != 0;
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#endif
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return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0;
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}
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@ -607,20 +617,22 @@ extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
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#define __HAVE_ARCH_PMD_WRITE
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static inline int pmd_write(pmd_t pmd)
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{
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if (pmd_prot_none(pmd))
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return 0;
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return (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT) == 0;
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return (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) != 0;
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}
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static inline int pmd_dirty(pmd_t pmd)
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{
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int dirty = 1;
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if (pmd_large(pmd))
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dirty = (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0;
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return dirty;
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}
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static inline int pmd_young(pmd_t pmd)
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{
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int young = 0;
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#ifdef CONFIG_64BIT
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if (pmd_prot_none(pmd))
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young = (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT) != 0;
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else
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int young = 1;
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if (pmd_large(pmd))
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young = (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;
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#endif
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return young;
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}
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@ -1391,7 +1403,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
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#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
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#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
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/* Find an entry in the lowest level page table.. */
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#define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
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@ -1413,41 +1425,75 @@ static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
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return pgprot_val(SEGMENT_WRITE);
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}
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static inline pmd_t pmd_wrprotect(pmd_t pmd)
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{
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_WRITE;
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pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
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return pmd;
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}
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static inline pmd_t pmd_mkwrite(pmd_t pmd)
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{
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pmd_val(pmd) |= _SEGMENT_ENTRY_WRITE;
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if (pmd_large(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY))
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return pmd;
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
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return pmd;
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}
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static inline pmd_t pmd_mkclean(pmd_t pmd)
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{
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if (pmd_large(pmd)) {
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_DIRTY;
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pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
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}
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return pmd;
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}
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static inline pmd_t pmd_mkdirty(pmd_t pmd)
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{
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if (pmd_large(pmd)) {
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pmd_val(pmd) |= _SEGMENT_ENTRY_DIRTY;
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if (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE)
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
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}
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return pmd;
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}
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static inline pmd_t pmd_mkyoung(pmd_t pmd)
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{
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#ifdef CONFIG_64BIT
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if (pmd_prot_none(pmd)) {
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pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
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} else {
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if (pmd_large(pmd)) {
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pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG;
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_INVALID;
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if (pmd_val(pmd) & _SEGMENT_ENTRY_READ)
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_INVALID;
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}
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#endif
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return pmd;
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}
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static inline pmd_t pmd_mkold(pmd_t pmd)
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{
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#ifdef CONFIG_64BIT
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if (pmd_prot_none(pmd)) {
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
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} else {
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if (pmd_large(pmd)) {
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_YOUNG;
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pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID;
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}
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#endif
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return pmd;
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}
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static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
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{
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int young;
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young = pmd_young(pmd);
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pmd_val(pmd) &= _SEGMENT_CHG_MASK;
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if (pmd_large(pmd)) {
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pmd_val(pmd) &= _SEGMENT_ENTRY_ORIGIN_LARGE |
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_SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_YOUNG |
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_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_SPLIT;
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pmd_val(pmd) |= massage_pgprot_pmd(newprot);
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if (!(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY))
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pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
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if (!(pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG))
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pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID;
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return pmd;
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}
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pmd_val(pmd) &= _SEGMENT_ENTRY_ORIGIN;
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pmd_val(pmd) |= massage_pgprot_pmd(newprot);
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if (young)
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pmd = pmd_mkyoung(pmd);
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return pmd;
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}
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@ -1455,16 +1501,9 @@ static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
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{
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pmd_t __pmd;
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pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
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return pmd_mkyoung(__pmd);
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return __pmd;
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}
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static inline pmd_t pmd_mkwrite(pmd_t pmd)
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{
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/* Do not clobber PROT_NONE segments! */
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if (!pmd_prot_none(pmd))
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pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
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return pmd;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */
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static inline void __pmdp_csp(pmd_t *pmdp)
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@ -1555,34 +1594,21 @@ extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
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static inline int pmd_trans_splitting(pmd_t pmd)
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{
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return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
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return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) &&
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(pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT);
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}
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static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t entry)
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{
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if (!(pmd_val(entry) & _SEGMENT_ENTRY_INVALID) && MACHINE_HAS_EDAT1)
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pmd_val(entry) |= _SEGMENT_ENTRY_CO;
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*pmdp = entry;
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}
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static inline pmd_t pmd_mkhuge(pmd_t pmd)
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{
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pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
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return pmd;
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}
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static inline pmd_t pmd_wrprotect(pmd_t pmd)
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{
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/* Do not clobber PROT_NONE segments! */
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if (!pmd_prot_none(pmd))
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pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
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return pmd;
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}
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static inline pmd_t pmd_mkdirty(pmd_t pmd)
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{
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/* No dirty bit in the segment table entry. */
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pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG;
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pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
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return pmd;
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}
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@ -1647,11 +1673,6 @@ static inline int has_transparent_hugepage(void)
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{
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return MACHINE_HAS_HPAGE ? 1 : 0;
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}
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static inline unsigned long pmd_pfn(pmd_t pmd)
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{
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return pmd_val(pmd) >> PAGE_SHIFT;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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/*
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@ -10,42 +10,33 @@
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static inline pmd_t __pte_to_pmd(pte_t pte)
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{
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int none, young, prot;
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pmd_t pmd;
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/*
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* Convert encoding pte bits pmd bits
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* .IR...wrdytp ..R...I...y.
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* empty .10...000000 -> ..0...1...0.
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* prot-none, clean, old .11...000001 -> ..0...1...1.
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* prot-none, clean, young .11...000101 -> ..1...1...1.
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* prot-none, dirty, old .10...001001 -> ..0...1...1.
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* prot-none, dirty, young .10...001101 -> ..1...1...1.
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* read-only, clean, old .11...010001 -> ..1...1...0.
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* read-only, clean, young .01...010101 -> ..1...0...1.
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* read-only, dirty, old .11...011001 -> ..1...1...0.
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* read-only, dirty, young .01...011101 -> ..1...0...1.
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* read-write, clean, old .11...110001 -> ..0...1...0.
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* read-write, clean, young .01...110101 -> ..0...0...1.
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* read-write, dirty, old .10...111001 -> ..0...1...0.
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* read-write, dirty, young .00...111101 -> ..0...0...1.
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* Huge ptes are dirty by definition, a clean pte is made dirty
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* by the conversion.
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* Convert encoding pte bits pmd bits
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* .IR...wrdytp dy..R...I...wr
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* empty .10...000000 -> 00..0...1...00
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* prot-none, clean, old .11...000001 -> 00..1...1...00
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* prot-none, clean, young .11...000101 -> 01..1...1...00
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* prot-none, dirty, old .10...001001 -> 10..1...1...00
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* prot-none, dirty, young .10...001101 -> 11..1...1...00
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* read-only, clean, old .11...010001 -> 00..1...1...01
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* read-only, clean, young .01...010101 -> 01..1...0...01
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* read-only, dirty, old .11...011001 -> 10..1...1...01
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* read-only, dirty, young .01...011101 -> 11..1...0...01
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* read-write, clean, old .11...110001 -> 00..0...1...11
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* read-write, clean, young .01...110101 -> 01..0...0...11
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* read-write, dirty, old .10...111001 -> 10..0...1...11
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* read-write, dirty, young .00...111101 -> 11..0...0...11
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*/
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if (pte_present(pte)) {
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pmd_val(pmd) = pte_val(pte) & PAGE_MASK;
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if (pte_val(pte) & _PAGE_INVALID)
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pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID;
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none = (pte_val(pte) & _PAGE_PRESENT) &&
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!(pte_val(pte) & _PAGE_READ) &&
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!(pte_val(pte) & _PAGE_WRITE);
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prot = (pte_val(pte) & _PAGE_PROTECT) &&
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!(pte_val(pte) & _PAGE_WRITE);
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young = pte_val(pte) & _PAGE_YOUNG;
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if (none || young)
|
||||
pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG;
|
||||
if (prot || (none && young))
|
||||
pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_READ) >> 4;
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_WRITE) >> 4;
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_INVALID) >> 5;
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_PROTECT);
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_DIRTY) << 10;
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_YOUNG) << 10;
|
||||
} else
|
||||
pmd_val(pmd) = _SEGMENT_ENTRY_INVALID;
|
||||
return pmd;
|
||||
@ -56,34 +47,31 @@ static inline pte_t __pmd_to_pte(pmd_t pmd)
|
||||
pte_t pte;
|
||||
|
||||
/*
|
||||
* Convert encoding pmd bits pte bits
|
||||
* ..R...I...y. .IR...wrdytp
|
||||
* empty ..0...1...0. -> .10...000000
|
||||
* prot-none, old ..0...1...1. -> .10...001001
|
||||
* prot-none, young ..1...1...1. -> .10...001101
|
||||
* read-only, old ..1...1...0. -> .11...011001
|
||||
* read-only, young ..1...0...1. -> .01...011101
|
||||
* read-write, old ..0...1...0. -> .10...111001
|
||||
* read-write, young ..0...0...1. -> .00...111101
|
||||
* Huge ptes are dirty by definition
|
||||
* Convert encoding pmd bits pte bits
|
||||
* dy..R...I...wr .IR...wrdytp
|
||||
* empty 00..0...1...00 -> .10...001100
|
||||
* prot-none, clean, old 00..0...1...00 -> .10...000001
|
||||
* prot-none, clean, young 01..0...1...00 -> .10...000101
|
||||
* prot-none, dirty, old 10..0...1...00 -> .10...001001
|
||||
* prot-none, dirty, young 11..0...1...00 -> .10...001101
|
||||
* read-only, clean, old 00..1...1...01 -> .11...010001
|
||||
* read-only, clean, young 01..1...1...01 -> .11...010101
|
||||
* read-only, dirty, old 10..1...1...01 -> .11...011001
|
||||
* read-only, dirty, young 11..1...1...01 -> .11...011101
|
||||
* read-write, clean, old 00..0...1...11 -> .10...110001
|
||||
* read-write, clean, young 01..0...1...11 -> .10...110101
|
||||
* read-write, dirty, old 10..0...1...11 -> .10...111001
|
||||
* read-write, dirty, young 11..0...1...11 -> .10...111101
|
||||
*/
|
||||
if (pmd_present(pmd)) {
|
||||
pte_val(pte) = _PAGE_PRESENT | _PAGE_LARGE | _PAGE_DIRTY |
|
||||
(pmd_val(pmd) & PAGE_MASK);
|
||||
if (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID)
|
||||
pte_val(pte) |= _PAGE_INVALID;
|
||||
if (pmd_prot_none(pmd)) {
|
||||
if (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT)
|
||||
pte_val(pte) |= _PAGE_YOUNG;
|
||||
} else {
|
||||
pte_val(pte) |= _PAGE_READ;
|
||||
if (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT)
|
||||
pte_val(pte) |= _PAGE_PROTECT;
|
||||
else
|
||||
pte_val(pte) |= _PAGE_WRITE;
|
||||
if (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG)
|
||||
pte_val(pte) |= _PAGE_YOUNG;
|
||||
}
|
||||
pte_val(pte) = pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN_LARGE;
|
||||
pte_val(pte) |= _PAGE_LARGE | _PAGE_PRESENT;
|
||||
pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_READ) << 4;
|
||||
pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) << 4;
|
||||
pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) << 5;
|
||||
pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT);
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_DIRTY) << 10;
|
||||
pmd_val(pmd) |= (pte_val(pte) & _PAGE_YOUNG) << 10;
|
||||
} else
|
||||
pte_val(pte) = _PAGE_INVALID;
|
||||
return pte;
|
||||
@ -96,6 +84,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
|
||||
|
||||
pmd = __pte_to_pmd(pte);
|
||||
if (!MACHINE_HAS_HPAGE) {
|
||||
/* Emulated huge ptes loose the dirty and young bit */
|
||||
pmd_val(pmd) &= ~_SEGMENT_ENTRY_ORIGIN;
|
||||
pmd_val(pmd) |= pte_page(pte)[1].index;
|
||||
} else
|
||||
@ -113,6 +102,8 @@ pte_t huge_ptep_get(pte_t *ptep)
|
||||
origin = pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN;
|
||||
pmd_val(pmd) &= ~_SEGMENT_ENTRY_ORIGIN;
|
||||
pmd_val(pmd) |= *(unsigned long *) origin;
|
||||
/* Emulated huge ptes are young and dirty by definition */
|
||||
pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG | _SEGMENT_ENTRY_DIRTY;
|
||||
}
|
||||
return __pmd_to_pte(pmd);
|
||||
}
|
||||
|
||||
@ -1433,6 +1433,9 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
|
||||
{
|
||||
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
|
||||
|
||||
entry = pmd_mkyoung(entry);
|
||||
if (dirty)
|
||||
entry = pmd_mkdirty(entry);
|
||||
if (pmd_same(*pmdp, entry))
|
||||
return 0;
|
||||
pmdp_invalidate(vma, address, pmdp);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user