From: Liam Howlett <liam.howlett@oracle.com>
To: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>,
Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH v2] mm/mmap: Introduce unlock_range() for code cleanup
Date: Mon, 10 May 2021 21:10:27 +0000 [thread overview]
Message-ID: <20210510211021.2797427-1-Liam.Howlett@Oracle.com> (raw)
Both __do_munmap() and exit_mmap() unlock a range of VMAs using almost
identical code blocks. Replace both blocks by a static inline function.
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
mm/mmap.c | 39 ++++++++++++++++++++-------------------
1 file changed, 20 insertions(+), 19 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 81f5595a8490..1bbb3225c958 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2801,6 +2801,22 @@ 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.
@@ -2889,17 +2905,8 @@ 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))
@@ -3184,14 +3191,8 @@ 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);
--
2.30.2
reply other threads:[~2021-05-10 21:10 UTC|newest]
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