- shmem_undo_range(inode,
- (loff_t)start << PAGE_CACHE_SHIFT,
- ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
+ if (index > start) {
+ shmem_undo_range(inode,
+ (loff_t)start << PAGE_CACHE_SHIFT,
+ ((loff_t)index << PAGE_CACHE_SHIFT) - 1, true);
+ }
/**
* shmem_zero_setup - setup a shared anonymous mapping
* @vma: the vma to be mmapped is prepared by do_mmap_pgoff
/**
* shmem_zero_setup - setup a shared anonymous mapping
* @vma: the vma to be mmapped is prepared by do_mmap_pgoff