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authorMel Gorman <mgorman@suse.de>2015-02-13 01:58:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 05:54:08 +0300
commit4d9424669946532be754a6e116618dcb58430cb4 (patch)
treeccebf7f5dbb8773bb774551d21cd95d0f30b6766 /mm/memory.c
parent842915f56667f9eebd85932f08c79565148c26d6 (diff)
downloadlinux-4d9424669946532be754a6e116618dcb58430cb4.tar.xz
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>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c10
1 files changed, 6 insertions, 4 deletions
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);