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Commit 4d942466 authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

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: default avatarMel Gorman <mgorman@suse.de>
Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Acked-by: default avatarAneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Tested-by: default avatarSasha 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 842915f5

arch/arm/include/asm/pgtable-3level.h

+4 −1
Original line number Diff line number Diff line
@@ -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)

{

include/linux/huge_mm.h

+1 −2
Original line number Diff line number Diff line
@@ -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,

mm/huge_memory.c

+7 −26
Original line number Diff line number Diff line
@@ -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 @@ int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma, 
 *  - 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;

			}

		}

		spin_unlock(ptl);

	}

mm/memory.c

+6 −4
Original line number Diff line number Diff line
@@ -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);

mm/mempolicy.c

+1 −1
Original line number Diff line number Diff line
@@ -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);