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Commit 146425a3 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
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[PATCH] freepgt: mpnt to vma cleanup 



While dabbling here in mmap.c, clean up mysterious "mpnt"s to "vma"s.

Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8f6c99c1

mm/mmap.c

+17 −18
Original line number Diff line number Diff line
@@ -1602,14 +1602,13 @@ static void unmap_vma(struct mm_struct *mm, struct vm_area_struct *area) 
 * Ok - we have the memory areas we should free on the 'free' list,

 * so release them, and do the vma updates.

 */

static void unmap_vma_list(struct mm_struct *mm,

	struct vm_area_struct *mpnt)

static void unmap_vma_list(struct mm_struct *mm, struct vm_area_struct *vma)

{

	do {

		struct vm_area_struct *next = mpnt->vm_next;

		unmap_vma(mm, mpnt);

		mpnt = next;

	} while (mpnt != NULL);

		struct vm_area_struct *next = vma->vm_next;

		unmap_vma(mm, vma);

		vma = next;

	} while (vma);

	validate_mm(mm);

}
@@ -1720,7 +1719,7 @@ int split_vma(struct mm_struct * mm, struct vm_area_struct * vma, 
int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)

{

	unsigned long end;

	struct vm_area_struct *mpnt, *prev, *last;

	struct vm_area_struct *vma, *prev, *last;



	if ((start & ~PAGE_MASK) || start > TASK_SIZE || len > TASK_SIZE-start)

		return -EINVAL;
@@ -1729,14 +1728,14 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) 
		return -EINVAL;



	/* Find the first overlapping VMA */

	mpnt = find_vma_prev(mm, start, &prev);

	if (!mpnt)

	vma = find_vma_prev(mm, start, &prev);

	if (!vma)

		return 0;

	/* we have  start < mpnt->vm_end  */

	/* we have  start < vma->vm_end  */



	/* if it doesn't overlap, we have nothing.. */

	end = start + len;

	if (mpnt->vm_start >= end)

	if (vma->vm_start >= end)

		return 0;



	/*
@@ -1746,11 +1745,11 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) 
	 * unmapped vm_area_struct will remain in use: so lower split_vma

	 * places tmp vma above, and higher split_vma places tmp vma below.

	 */

	if (start > mpnt->vm_start) {

		int error = split_vma(mm, mpnt, start, 0);

	if (start > vma->vm_start) {

		int error = split_vma(mm, vma, start, 0);

		if (error)

			return error;

		prev = mpnt;

		prev = vma;

	}



	/* Does it split the last one? */
@@ -1760,16 +1759,16 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) 
		if (error)

			return error;

	}

	mpnt = prev? prev->vm_next: mm->mmap;

	vma = prev? prev->vm_next: mm->mmap;



	/*

	 * Remove the vma's, and unmap the actual pages

	 */

	detach_vmas_to_be_unmapped(mm, mpnt, prev, end);

	unmap_region(mm, mpnt, prev, start, end);

	detach_vmas_to_be_unmapped(mm, vma, prev, end);

	unmap_region(mm, vma, prev, start, end);



	/* Fix up all other VM information */

	unmap_vma_list(mm, mpnt);

	unmap_vma_list(mm, vma);



	return 0;

}