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mm/mmap: don't use __vma_adjust() in shift_arg_pages()

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Introduce shrink_vma() which uses the vma_prepare() and vma_complete()
functions to reduce the vma coverage.

Convert shift_arg_pages() to use expand_vma() and the new shrink_vma()
function.  Remove support from __vma_adjust() to reduce a vma size since
shift_arg_pages() is the only user that shrinks a VMA in this way.

Link: https://lkml.kernel.org/r/20230120162650.984577-46-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-01-20 11:26:46 -05:00 • committed by Andrew Morton
parent 7c9813e886
commit cf51e86dfb
3 changed files with 47 additions and 19 deletions
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4
fs/exec.c
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@ -699,7 +699,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
/*
* cover the whole range: [new_start, old_end)
*/
if (vma_adjust(&vmi, vma, new_start, old_end, vma->vm_pgoff))
if (vma_expand(&vmi, vma, new_start, old_end, vma->vm_pgoff, NULL))
return -ENOMEM;
/*
@ -733,7 +733,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
vma_prev(&vmi);
/* Shrink the vma to just the new range */
return vma_adjust(&vmi, vma, new_start, new_end, vma->vm_pgoff);
return vma_shrink(&vmi, vma, new_start, new_end, vma->vm_pgoff);
}
/*