@@ -1938,20 +1938,8 @@ int iov_iter_npages(const struct iov_iter *i, int maxpages)
return min(npages, maxpages);
}
if (iov_iter_is_xarray(i)) {
- size_t size = i->count;
- unsigned offset;
- int npages;
-
- offset = (i->xarray_start + i->iov_offset) & ~PAGE_MASK;
-
- npages = 1;
- if (size > PAGE_SIZE - offset) {
- size -= PAGE_SIZE - offset;
- npages += size >> PAGE_SHIFT;
- size &= ~PAGE_MASK;
- if (size)
- npages++;
- }
+ unsigned offset = (i->xarray_start + i->iov_offset) % PAGE_SIZE;
+ int npages = DIV_ROUND_UP(offset + i->count, PAGE_SIZE);
return min(npages, maxpages);
}
return 0;
Compiler is capable of recognizing division by power of 2 and turning it into shifts. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- lib/iov_iter.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-)