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Commit 46dcde73 authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Linus Torvalds
Browse files

thp: introduce pmdp_invalidate() 



On s390, a valid page table entry must not be changed while it is attached
to any CPU.  So instead of pmd_mknotpresent() and set_pmd_at(), an IDTE
operation would be necessary there.  This patch introduces the
pmdp_invalidate() function, to allow architecture-specific
implementations.

Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e3ebcf64

include/asm-generic/pgtable.h

+5 −0
Original line number Diff line number Diff line
@@ -170,6 +170,11 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable); 
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);

#endif



#ifndef __HAVE_ARCH_PMDP_INVALIDATE

extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,

			    pmd_t *pmdp);

#endif



#ifndef __HAVE_ARCH_PTE_SAME

static inline int pte_same(pte_t pte_a, pte_t pte_b)

{

mm/huge_memory.c

+1 −2
Original line number Diff line number Diff line
@@ -1361,8 +1361,7 @@ static int __split_huge_page_map(struct page *page, 
		 * SMP TLB and finally we write the non-huge version

		 * of the pmd entry with pmd_populate.

		 */

		set_pmd_at(mm, address, pmd, pmd_mknotpresent(*pmd));

		flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);

		pmdp_invalidate(vma, address, pmd);

		pmd_populate(mm, pmd, pgtable);

		ret = 1;

	}

mm/pgtable-generic.c

+11 −0
Original line number Diff line number Diff line
@@ -159,3 +159,14 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm) 
}

#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif



#ifndef __HAVE_ARCH_PMDP_INVALIDATE

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,

		     pmd_t *pmdp)

{

	set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));

	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);

}

#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#endif