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iterate_and_advance(): get rid of magic in case when n is 0 

iov_iter_advance() needs to do some non-trivial work when it's given
0 as argument (skip all empty iovecs, mostly).  We used to implement
it via iterate_and_advance(); we no longer do so and for all other
users of iterate_and_advance() zero length is a no-op.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-04-28 20:59:08 -04:00
parent 594e450b3f
commit f5da83545f
1 changed files with 1 additions and 1 deletions
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2
lib/iov_iter.c
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@ -117,7 +117,7 @@
#define iterate_and_advance(i, n, v, I, B, K, X) { \
if (unlikely(i->count < n)) \
n = i->count; \
if (i->count) { \
if (likely(n)) { \
size_t skip = i->iov_offset; \
if (likely(iter_is_iovec(i))) { \
const struct iovec *iov; \