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mm/mmap: introduce unlock_range() for code cleanup

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Both __do_munmap() and exit_mmap() unlock a range of VMAs using almost
identical code blocks.  Replace both blocks by a static inline function.

[akpm@linux-foundation.org: tweak code layout]

Link: https://lkml.kernel.org/r/20210510211021.2797427-1-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Liam Howlett 2021-06-28 19:38:41 -07:00 committed by Linus Torvalds
parent 78d9cf6041
commit 96d990239e
1 changed files with 20 additions and 19 deletions
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39
mm/mmap.c
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@ -2802,6 +2802,22 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
return __split_vma(mm, vma, addr, new_below);
}
static inline void
unlock_range(struct vm_area_struct *start, unsigned long limit)
{
struct mm_struct *mm = start->vm_mm;
struct vm_area_struct *tmp = start;
while (tmp && tmp->vm_start < limit) {
if (tmp->vm_flags & VM_LOCKED) {
mm->locked_vm -= vma_pages(tmp);
munlock_vma_pages_all(tmp);
}
tmp = tmp->vm_next;
}
}
/* Munmap is split into 2 main parts -- this part which finds
* what needs doing, and the areas themselves, which do the
* work. This now handles partial unmappings.
@ -2885,17 +2901,8 @@ int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
/*
* unlock any mlock()ed ranges before detaching vmas
*/
if (mm->locked_vm) {
struct vm_area_struct *tmp = vma;
while (tmp && tmp->vm_start < end) {
if (tmp->vm_flags & VM_LOCKED) {
mm->locked_vm -= vma_pages(tmp);
munlock_vma_pages_all(tmp);
}
tmp = tmp->vm_next;
}
}
if (mm->locked_vm)
unlock_range(vma, end);
/* Detach vmas from rbtree */
if (!detach_vmas_to_be_unmapped(mm, vma, prev, end))
@ -3180,14 +3187,8 @@ void exit_mmap(struct mm_struct *mm)
mmap_write_unlock(mm);
}
if (mm->locked_vm) {
vma = mm->mmap;
while (vma) {
if (vma->vm_flags & VM_LOCKED)
munlock_vma_pages_all(vma);
vma = vma->vm_next;
}
}
if (mm->locked_vm)
unlock_range(mm->mmap, ULONG_MAX);
arch_exit_mmap(mm);