On 8/10/18 10:41 AM, Matthew Wilcox wrote:
On Fri, Aug 10, 2018 at 07:36:00AM +0800, Yang Shi wrote:
+static inline bool addr_ok(unsigned long start, size_t len)
Maybe munmap_range_ok()? Otherwise some of the conditions here don't make
sense for such a generic sounding function.
I don't know. I think the argument is about munmap_ prefix should be used.
{
- unsigned long end;
- struct vm_area_struct *vma, *prev, *last;
-
if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
- return -EINVAL;
+ return false;
- len = PAGE_ALIGN(len);
- if (len == 0)
- return -EINVAL;
+ if (PAGE_ALIGN(len) == 0)
+ return false;
+
+ return true;
+}
+
+/*
+ * munmap_lookup_vma: find the first overlap vma and split overlap vmas.
+ * @mm: mm_struct
+ * @start: start address
+ * @end: end address
+ *
+ * returns the pointer to vma, NULL or err ptr when spilt_vma returns error.
kernel-doc prefers:
* Return: %NULL if no VMA overlaps this range. An ERR_PTR if an
* overlapping VMA could not be split. Otherwise a pointer to the first
* VMA which overlaps the range.
Ok, will fix it.
+ */
+static struct vm_area_struct *munmap_lookup_vma(struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ struct vm_area_struct *vma, *prev, *last;
/* Find the first overlapping VMA */
vma = find_vma(mm, start);
if (!vma)
- return 0;
- prev = vma->vm_prev;
- /* we have start < vma->vm_end */
+ return NULL;
+ /* we have start < vma->vm_end */
Can you remove the duplicate spaces here?
Sure
Thanks,
Yang
