From: Al Viro Date: Tue, 27 Apr 2021 16:29:53 +0000 (-0400) Subject: copy_page_to_iter(): don't bother with kmap_atomic() for bvec/kvec cases X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c1d4d6a9ae88b87262fb5426823930bc471f6034;p=linux.git copy_page_to_iter(): don't bother with kmap_atomic() for bvec/kvec cases kmap_local_page() is enough there. Moreover, we can use _copy_to_iter() for actual copying in those cases - no useful extra checks on the address we are copying from in that call. Signed-off-by: Al Viro --- diff --git a/lib/iov_iter.c b/lib/iov_iter.c index d5f750cc6f4a9..8aff4eb4fdfd8 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -821,9 +821,9 @@ static size_t __copy_page_to_iter(struct page *page, size_t offset, size_t bytes if (likely(iter_is_iovec(i))) return copy_page_to_iter_iovec(page, offset, bytes, i); if (iov_iter_is_bvec(i) || iov_iter_is_kvec(i) || iov_iter_is_xarray(i)) { - void *kaddr = kmap_atomic(page); - size_t wanted = copy_to_iter(kaddr + offset, bytes, i); - kunmap_atomic(kaddr); + void *kaddr = kmap_local_page(page); + size_t wanted = _copy_to_iter(kaddr + offset, bytes, i); + kunmap_local(kaddr); return wanted; } if (iov_iter_is_pipe(i))