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authorMel Gorman <mgorman@suse.de>2015-02-12 14:58:28 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 18:54:08 -0800
commit4d9424669946532be754a6e116618dcb58430cb4 (patch)
treeccebf7f5dbb8773bb774551d21cd95d0f30b6766
parent842915f56667f9eebd85932f08c79565148c26d6 (diff)
mm: convert p[te|md]_mknonnuma and remaining page table manipulations
With PROT_NONE, the traditional page table manipulation functions are sufficient. [andre.przywara@arm.com: fix compiler warning in pmdp_invalidate()] [akpm@linux-foundation.org: fix build with STRICT_MM_TYPECHECKS] Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Dave Jones <davej@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/arm/include/asm/pgtable-3level.h5
-rw-r--r--include/linux/huge_mm.h3
-rw-r--r--mm/huge_memory.c33
-rw-r--r--mm/memory.c10
-rw-r--r--mm/mempolicy.c2
-rw-r--r--mm/migrate.c2
-rw-r--r--mm/mprotect.c2
-rw-r--r--mm/pgtable-generic.c2
8 files changed, 21 insertions, 38 deletions
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 18dbc82f85e5..423a5ac09d3a 100644
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -257,7 +257,10 @@ PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF);
#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)
/* represent a notpresent pmd by zero, this is used by pmdp_invalidate */
-#define pmd_mknotpresent(pmd) (__pmd(0))
+static inline pmd_t pmd_mknotpresent(pmd_t pmd)
+{
+ return __pmd(0);
+}
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index f10b20f05159..062bd252e994 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -31,8 +31,7 @@ extern int move_huge_pmd(struct vm_area_struct *vma,
unsigned long new_addr, unsigned long old_end,
pmd_t *old_pmd, pmd_t *new_pmd);
extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, pgprot_t newprot,
- int prot_numa);
+ unsigned long addr, pgprot_t newprot);
enum transparent_hugepage_flag {
TRANSPARENT_HUGEPAGE_FLAG,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 915941c45169..cb9b3e847dac 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1355,9 +1355,8 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto out;
clear_pmdnuma:
BUG_ON(!PageLocked(page));
- pmd = pmd_mknonnuma(pmd);
+ pmd = pmd_modify(pmd, vma->vm_page_prot);
set_pmd_at(mm, haddr, pmdp, pmd);
- VM_BUG_ON(pmd_protnone(*pmdp));
update_mmu_cache_pmd(vma, addr, pmdp);
unlock_page(page);
out_unlock:
@@ -1472,7 +1471,7 @@ out:
* - HPAGE_PMD_NR is protections changed and TLB flush necessary
*/
int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, pgprot_t newprot, int prot_numa)
+ unsigned long addr, pgprot_t newprot)
{
struct mm_struct *mm = vma->vm_mm;
spinlock_t *ptl;
@@ -1481,29 +1480,11 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
if (__pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
pmd_t entry;
ret = 1;
- if (!prot_numa) {
- entry = pmdp_get_and_clear_notify(mm, addr, pmd);
- if (pmd_protnone(entry))
- entry = pmd_mknonnuma(entry);
- entry = pmd_modify(entry, newprot);
- ret = HPAGE_PMD_NR;
- set_pmd_at(mm, addr, pmd, entry);
- BUG_ON(pmd_write(entry));
- } else {
- struct page *page = pmd_page(*pmd);
-
- /*
- * Do not trap faults against the zero page. The
- * read-only data is likely to be read-cached on the
- * local CPU cache and it is less useful to know about
- * local vs remote hits on the zero page.
- */
- if (!is_huge_zero_page(page) &&
- !pmd_protnone(*pmd)) {
- pmdp_set_numa(mm, addr, pmd);
- ret = HPAGE_PMD_NR;
- }
- }
+ entry = pmdp_get_and_clear_notify(mm, addr, pmd);
+ entry = pmd_modify(entry, newprot);
+ ret = HPAGE_PMD_NR;
+ set_pmd_at(mm, addr, pmd, entry);
+ BUG_ON(pmd_write(entry));
spin_unlock(ptl);
}
diff --git a/mm/memory.c b/mm/memory.c
index 92e6a6299e86..d7921760cf79 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3018,9 +3018,9 @@ static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
* validation through pte_unmap_same(). It's of NUMA type but
* the pfn may be screwed if the read is non atomic.
*
- * ptep_modify_prot_start is not called as this is clearing
- * the _PAGE_NUMA bit and it is not really expected that there
- * would be concurrent hardware modifications to the PTE.
+ * We can safely just do a "set_pte_at()", because the old
+ * page table entry is not accessible, so there would be no
+ * concurrent hardware modifications to the PTE.
*/
ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
@@ -3029,7 +3029,9 @@ static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto out;
}
- pte = pte_mknonnuma(pte);
+ /* Make it present again */
+ pte = pte_modify(pte, vma->vm_page_prot);
+ pte = pte_mkyoung(pte);
set_pte_at(mm, addr, ptep, pte);
update_mmu_cache(vma, addr, ptep);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index f1bd23803576..c75f4dcec808 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -569,7 +569,7 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
{
int nr_updated;
- nr_updated = change_protection(vma, addr, end, vma->vm_page_prot, 0, 1);
+ nr_updated = change_protection(vma, addr, end, PAGE_NONE, 0, 1);
if (nr_updated)
count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated);
diff --git a/mm/migrate.c b/mm/migrate.c
index 5e8f03a8de2a..85e042686031 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1847,7 +1847,7 @@ out_fail:
out_dropref:
ptl = pmd_lock(mm, pmd);
if (pmd_same(*pmd, entry)) {
- entry = pmd_mknonnuma(entry);
+ entry = pmd_modify(entry, vma->vm_page_prot);
set_pmd_at(mm, mmun_start, pmd, entry);
update_mmu_cache_pmd(vma, address, &entry);
}
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 44ffa698484d..76824d73380d 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -142,7 +142,7 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
split_huge_page_pmd(vma, addr, pmd);
else {
int nr_ptes = change_huge_pmd(vma, pmd, addr,
- newprot, prot_numa);
+ newprot);
if (nr_ptes) {
if (nr_ptes == HPAGE_PMD_NR) {
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index 4b8ad760dde3..c25f94b33811 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -193,8 +193,6 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
pmd_t entry = *pmdp;
- if (pmd_protnone(entry))
- entry = pmd_mknonnuma(entry);
set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}