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authorLiam R. Howlett <Liam.Howlett@Oracle.com>2023-01-20 11:26:36 -0500
committerAndrew Morton <akpm@linux-foundation.org>2023-02-09 16:51:36 -0800
commit0fd5a9e2b09ff589370f2c536df77654ed2d341f (patch)
treeda34cf01e5c9eceeda7669e6ad46befdc102762a /mm/mmap.c
parentc465be97a4bc0022688d99f77a75b9be91843b31 (diff)
mm: pass vma iterator through to __vma_adjust()
Pass the iterator through to be used in __vma_adjust(). The state of the iterator needs to be correct for the operation that will occur so make the adjustments. Link: https://lkml.kernel.org/r/20230120162650.984577-36-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index bd3ccfb4d9e0..1bdf66b3b96e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -525,6 +525,10 @@ inline int vma_expand(struct vma_iterator *vmi, struct vm_area_struct *vma,
vma_interval_tree_remove(vma, root);
}
+ /* VMA iterator points to previous, so set to start if necessary */
+ if (vma_iter_addr(vmi) != start)
+ vma_iter_set(vmi, start);
+
vma->vm_start = start;
vma->vm_end = end;
vma->vm_pgoff = pgoff;
@@ -2164,13 +2168,13 @@ static void unmap_region(struct mm_struct *mm, struct maple_tree *mt,
/*
* __split_vma() bypasses sysctl_max_map_count checking. We use this where it
* has already been checked or doesn't make sense to fail.
+ * VMA Iterator will point to the end VMA.
*/
int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
unsigned long addr, int new_below)
{
struct vm_area_struct *new;
int err;
- unsigned long end = vma->vm_end;
validate_mm_mt(vma->vm_mm);
@@ -2206,14 +2210,17 @@ int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *vma,
new->vm_ops->open(new);
if (new_below)
- err = vma_adjust(vma, addr, vma->vm_end, vma->vm_pgoff +
- ((addr - new->vm_start) >> PAGE_SHIFT), new);
+ err = __vma_adjust(vmi, vma, addr, vma->vm_end,
+ vma->vm_pgoff + ((addr - new->vm_start) >> PAGE_SHIFT),
+ new, NULL);
else
- err = vma_adjust(vma, vma->vm_start, addr, vma->vm_pgoff, new);
+ err = __vma_adjust(vmi, vma, vma->vm_start, addr, vma->vm_pgoff,
+ new, NULL);
/* Success. */
if (!err) {
- vma_iter_set(vmi, end);
+ if (new_below)
+ vma_next(vmi);
return 0;
}
@@ -2308,8 +2315,7 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
if (error)
goto start_split_failed;
- vma_iter_set(vmi, start);
- vma = vma_find(vmi, end);
+ vma = vma_iter_load(vmi);
}
prev = vma_prev(vmi);
@@ -2329,7 +2335,6 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
if (error)
goto end_split_failed;
- vma_iter_set(vmi, end);
split = vma_prev(vmi);
error = munmap_sidetree(split, &mas_detach);
if (error)
@@ -2573,6 +2578,7 @@ cannot_expand:
goto unacct_error;
}
+ vma_iter_set(&vmi, addr);
vma->vm_start = addr;
vma->vm_end = end;
vma->vm_flags = vm_flags;