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authorLiam R. Howlett <Liam.Howlett@oracle.com>2023-07-24 14:31:48 -0400
committerAndrew Morton <akpm@linux-foundation.org>2023-08-18 10:12:48 -0700
commit53bee98d004fcd7062f2fe056720704e947e6000 (patch)
treeeeb3c78fcc8a561cccadbe71a552c72fbd0a1e3f /mm/mmap.c
parentc1297987cc2ada57a7faea7985c2334548d110f9 (diff)
mm: remove re-walk from mmap_region()
Using vma_iter_set() will reset the tree and cause a re-walk. Use vmi_iter_config() to set the write to a sub-set of the range. Change the file case to also use vmi_iter_config() so that the end is correctly set. Link: https://lkml.kernel.org/r/20230724183157.3939892-7-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Peng Zhang <zhangpeng.00@bytedance.com> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 5fbc7d71d60c..a1a59487390e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2676,8 +2676,11 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
next = vma_next(&vmi);
prev = vma_prev(&vmi);
- if (vm_flags & VM_SPECIAL)
+ if (vm_flags & VM_SPECIAL) {
+ if (prev)
+ vma_iter_next_range(&vmi);
goto cannot_expand;
+ }
/* Attempt to expand an old mapping */
/* Check next */
@@ -2698,6 +2701,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
merge_start = prev->vm_start;
vma = prev;
vm_pgoff = prev->vm_pgoff;
+ } else if (prev) {
+ vma_iter_next_range(&vmi);
}
@@ -2708,9 +2713,9 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
goto expanded;
}
+ if (vma == prev)
+ vma_iter_set(&vmi, addr);
cannot_expand:
- if (prev)
- vma_iter_next_range(&vmi);
/*
* Determine the object being mapped and call the appropriate
@@ -2723,7 +2728,7 @@ cannot_expand:
goto unacct_error;
}
- vma_iter_set(&vmi, addr);
+ vma_iter_config(&vmi, addr, end);
vma->vm_start = addr;
vma->vm_end = end;
vm_flags_init(vma, vm_flags);
@@ -2750,7 +2755,7 @@ cannot_expand:
if (WARN_ON((addr != vma->vm_start)))
goto close_and_free_vma;
- vma_iter_set(&vmi, addr);
+ vma_iter_config(&vmi, addr, end);
/*
* If vm_flags changed after call_mmap(), we should try merge
* vma again as we may succeed this time.