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| author | Al Viro <viro@zeniv.linux.org.uk> | 2021-04-30 19:40:48 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2021-06-10 17:45:23 +0200 |
| commit | 2495bdcc86dc5e6b71b6785e1faa76452496c687 (patch) | |
| tree | a3ae036caa4ad9933c94ce1ba1e80b09cc3694e1 /lib | |
| parent | copy_page_from_iter(): don't need kmap_atomic() for kvec/bvec cases (diff) | |
| download | linux-2495bdcc86dc5e6b71b6785e1faa76452496c687.tar.xz linux-2495bdcc86dc5e6b71b6785e1faa76452496c687.zip | |
iov_iter: clean csum_and_copy_...() primitives up a bit
1) kmap_atomic() is not needed here, kmap_local_page() is enough.
2) No need to make sum = csum_block_add(sum, next, off); conditional
upon next != 0 - adding 0 is a no-op as far as csum_block_add()
is concerned.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/iov_iter.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index ba7eb6557750..3b442d25a966 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -600,9 +600,9 @@ static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes, return 0; do { size_t chunk = min_t(size_t, n, PAGE_SIZE - r); - char *p = kmap_atomic(pipe->bufs[i_head & p_mask].page); + char *p = kmap_local_page(pipe->bufs[i_head & p_mask].page); sum = csum_and_memcpy(p + r, addr, chunk, sum, off); - kunmap_atomic(p); + kunmap_local(p); i->head = i_head; i->iov_offset = r + chunk; n -= chunk; @@ -1665,8 +1665,7 @@ size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, } iterate_and_advance(i, bytes, base, len, off, ({ next = csum_and_copy_from_user(base, addr + off, len); - if (next) - sum = csum_block_add(sum, next, off); + sum = csum_block_add(sum, next, off); next ? 0 : len; }), ({ sum = csum_and_memcpy(addr + off, base, len, sum, off); @@ -1693,8 +1692,7 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *_csstate, } iterate_and_advance(i, bytes, base, len, off, ({ next = csum_and_copy_to_user(addr + off, base, len); - if (next) - sum = csum_block_add(sum, next, off); + sum = csum_block_add(sum, next, off); next ? 0 : len; }), ({ sum = csum_and_memcpy(base, addr + off, len, sum, off); |