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Commit 900fc5f1 authored by Naoya Horiguchi's avatar Naoya Horiguchi Committed by Linus Torvalds
Browse files

pagewalk: add walk_page_vma() 



Introduce walk_page_vma(), which is useful for the callers which want to
walk over a given vma.  It's used by later patches.

Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fafaa426

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -1201,6 +1201,7 @@ struct mm_walk { 


int walk_page_range(unsigned long addr, unsigned long end,

		struct mm_walk *walk);

int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);

void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,

		unsigned long end, unsigned long floor, unsigned long ceiling);

int copy_page_range(struct mm_struct *dst, struct mm_struct *src,

mm/pagewalk.c

+18 −0
Original line number Diff line number Diff line
@@ -272,3 +272,21 @@ int walk_page_range(unsigned long start, unsigned long end, 
	} while (start = next, start < end);

	return err;

}



int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk)

{

	int err;



	if (!walk->mm)

		return -EINVAL;



	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));

	VM_BUG_ON(!vma);

	walk->vma = vma;

	err = walk_page_test(vma->vm_start, vma->vm_end, walk);

	if (err > 0)

		return 0;

	if (err < 0)

		return err;

	return __walk_page_range(vma->vm_start, vma->vm_end, walk);

}