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copy_page_from_iter(): don't need kmap_atomic() for kvec/bvec cases 

kmap_local_page() is enough.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-04-27 12:33:24 -04:00
parent c1d4d6a9ae
commit 55ca375c5d
1 changed files with 2 additions and 2 deletions
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4
lib/iov_iter.c
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@ -871,9 +871,9 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
if (likely(iter_is_iovec(i))) if (likely(iter_is_iovec(i)))
return copy_page_from_iter_iovec(page, offset, bytes, i); return copy_page_from_iter_iovec(page, offset, bytes, i);
if (iov_iter_is_bvec(i) || iov_iter_is_kvec(i) || iov_iter_is_xarray(i)) { if (iov_iter_is_bvec(i) || iov_iter_is_kvec(i) || iov_iter_is_xarray(i)) {
void *kaddr = kmap_atomic(page); void *kaddr = kmap_local_page(page);
size_t wanted = _copy_from_iter(kaddr + offset, bytes, i); size_t wanted = _copy_from_iter(kaddr + offset, bytes, i);
kunmap_atomic(kaddr); kunmap_local(kaddr);
return wanted; return wanted;
} }
WARN_ON(1); WARN_ON(1);