mm/hugetlb: add more arch-defined huge_pte functions
Commit abf09bed3cce ("s390/mm: implement software dirty bits")
introduced another difference in the pte layout vs. the pmd layout on
s390, thoroughly breaking the s390 support for hugetlbfs. This requires
replacing some more pte_xxx functions in mm/hugetlbfs.c with a
huge_pte_xxx version.
This patch introduces those huge_pte_xxx functions and their generic
implementation in asm-generic/hugetlb.h, which will now be included on
all architectures supporting hugetlbfs apart from s390. This change
will be a no-op for those architectures.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.cz> [for !s390 parts]
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index 593753e..bd90359 100644
--- a/arch/s390/include/asm/hugetlb.h
+++ b/arch/s390/include/asm/hugetlb.h
@@ -114,7 +114,7 @@
#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
({ \
pte_t __pte = huge_ptep_get(__ptep); \
- if (pte_write(__pte)) { \
+ if (huge_pte_write(__pte)) { \
huge_ptep_invalidate(__mm, __addr, __ptep); \
set_huge_pte_at(__mm, __addr, __ptep, \
huge_pte_wrprotect(__pte)); \
@@ -127,4 +127,58 @@
huge_ptep_invalidate(vma->vm_mm, address, ptep);
}
+static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
+{
+ pte_t pte;
+ pmd_t pmd;
+
+ pmd = mk_pmd_phys(page_to_phys(page), pgprot);
+ pte_val(pte) = pmd_val(pmd);
+ return pte;
+}
+
+static inline int huge_pte_write(pte_t pte)
+{
+ pmd_t pmd;
+
+ pmd_val(pmd) = pte_val(pte);
+ return pmd_write(pmd);
+}
+
+static inline int huge_pte_dirty(pte_t pte)
+{
+ /* No dirty bit in the segment table entry. */
+ return 0;
+}
+
+static inline pte_t huge_pte_mkwrite(pte_t pte)
+{
+ pmd_t pmd;
+
+ pmd_val(pmd) = pte_val(pte);
+ pte_val(pte) = pmd_val(pmd_mkwrite(pmd));
+ return pte;
+}
+
+static inline pte_t huge_pte_mkdirty(pte_t pte)
+{
+ /* No dirty bit in the segment table entry. */
+ return pte;
+}
+
+static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
+{
+ pmd_t pmd;
+
+ pmd_val(pmd) = pte_val(pte);
+ pte_val(pte) = pmd_val(pmd_modify(pmd, newprot));
+ return pte;
+}
+
+static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep)
+{
+ pmd_clear((pmd_t *) ptep);
+}
+
#endif /* _ASM_S390_HUGETLB_H */
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 4a64c0e..b462291 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -424,6 +424,13 @@
#define __S110 PAGE_RW
#define __S111 PAGE_RW
+/*
+ * Segment entry (large page) protection definitions.
+ */
+#define SEGMENT_NONE __pgprot(_HPAGE_TYPE_NONE)
+#define SEGMENT_RO __pgprot(_HPAGE_TYPE_RO)
+#define SEGMENT_RW __pgprot(_HPAGE_TYPE_RW)
+
static inline int mm_exclusive(struct mm_struct *mm)
{
return likely(mm == current->active_mm &&
@@ -914,26 +921,6 @@
#ifdef CONFIG_HUGETLB_PAGE
static inline pte_t pte_mkhuge(pte_t pte)
{
- /*
- * PROT_NONE needs to be remapped from the pte type to the ste type.
- * The HW invalid bit is also different for pte and ste. The pte
- * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
- * bit, so we don't have to clear it.
- */
- if (pte_val(pte) & _PAGE_INVALID) {
- if (pte_val(pte) & _PAGE_SWT)
- pte_val(pte) |= _HPAGE_TYPE_NONE;
- pte_val(pte) |= _SEGMENT_ENTRY_INV;
- }
- /*
- * Clear SW pte bits, there are no SW bits in a segment table entry.
- */
- pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX | _PAGE_SWC |
- _PAGE_SWR | _PAGE_SWW);
- /*
- * Also set the change-override bit because we don't need dirty bit
- * tracking for hugetlbfs pages.
- */
pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
return pte;
}
@@ -1278,31 +1265,7 @@
}
}
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-
-#define SEGMENT_NONE __pgprot(_HPAGE_TYPE_NONE)
-#define SEGMENT_RO __pgprot(_HPAGE_TYPE_RO)
-#define SEGMENT_RW __pgprot(_HPAGE_TYPE_RW)
-
-#define __HAVE_ARCH_PGTABLE_DEPOSIT
-extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
-
-#define __HAVE_ARCH_PGTABLE_WITHDRAW
-extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
-
-static inline int pmd_trans_splitting(pmd_t pmd)
-{
- return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
-}
-
-static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmdp, pmd_t entry)
-{
- if (!(pmd_val(entry) & _SEGMENT_ENTRY_INV) && MACHINE_HAS_EDAT1)
- pmd_val(entry) |= _SEGMENT_ENTRY_CO;
- *pmdp = entry;
-}
-
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)
static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
{
/*
@@ -1323,10 +1286,11 @@
return pmd;
}
-static inline pmd_t pmd_mkhuge(pmd_t pmd)
+static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
{
- pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
- return pmd;
+ pmd_t __pmd;
+ pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
+ return __pmd;
}
static inline pmd_t pmd_mkwrite(pmd_t pmd)
@@ -1336,6 +1300,34 @@
pmd_val(pmd) &= ~_SEGMENT_ENTRY_RO;
return pmd;
}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+
+#define __HAVE_ARCH_PGTABLE_DEPOSIT
+extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
+
+#define __HAVE_ARCH_PGTABLE_WITHDRAW
+extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
+
+static inline int pmd_trans_splitting(pmd_t pmd)
+{
+ return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
+}
+
+static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, pmd_t entry)
+{
+ if (!(pmd_val(entry) & _SEGMENT_ENTRY_INV) && MACHINE_HAS_EDAT1)
+ pmd_val(entry) |= _SEGMENT_ENTRY_CO;
+ *pmdp = entry;
+}
+
+static inline pmd_t pmd_mkhuge(pmd_t pmd)
+{
+ pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
+ return pmd;
+}
static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
@@ -1432,13 +1424,6 @@
}
}
-static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
-{
- pmd_t __pmd;
- pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
- return __pmd;
-}
-
#define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 532525e..121089d 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -39,7 +39,7 @@
if (!ptep)
return -ENOMEM;
- pte = mk_pte(page, PAGE_RW);
+ pte_val(pte) = addr;
for (i = 0; i < PTRS_PER_PTE; i++) {
set_pte_at(&init_mm, addr + i * PAGE_SIZE, ptep + i, pte);
pte_val(pte) += PAGE_SIZE;