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clean up copy_mc_pipe_to_iter()

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... and we don't need kmap_atomic() there - kmap_local_page() is fine.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-05-02 17:16:34 -04:00
parent 893839fd57
commit 2a510a744b
1 changed files with 9 additions and 24 deletions
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33
lib/iov_iter.c
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@ -642,19 +642,6 @@ static int copyout_mc(void __user *to, const void *from, size_t n)
return n;
}
static unsigned long copy_mc_to_page(struct page *page, size_t offset,
const char *from, size_t len)
{
unsigned long ret;
char *to;
to = kmap_atomic(page);
ret = copy_mc_to_kernel(to + offset, from, len);
kunmap_atomic(to);
return ret;
}
static size_t copy_mc_pipe_to_iter(const void *addr, size_t bytes,
struct iov_iter *i)
{
@ -666,25 +653,23 @@ static size_t copy_mc_pipe_to_iter(const void *addr, size_t bytes,
if (!sanity(i))
return 0;
bytes = n = push_pipe(i, bytes, &i_head, &off);
if (unlikely(!n))
return 0;
do {
n = push_pipe(i, bytes, &i_head, &off);
while (n) {
size_t chunk = min_t(size_t, n, PAGE_SIZE - off);
char *p = kmap_local_page(pipe->bufs[i_head & p_mask].page);
unsigned long rem;
rem = copy_mc_to_page(pipe->bufs[i_head & p_mask].page,
off, addr, chunk);
rem = copy_mc_to_kernel(p + off, addr + xfer, chunk);
chunk -= rem;
kunmap_local(p);
i->head = i_head;
i->iov_offset = off + chunk - rem;
xfer += chunk - rem;
i->iov_offset = off + chunk;
xfer += chunk;
if (rem)
break;
n -= chunk;
addr += chunk;
off = 0;
i_head++;
} while (n);
}
i->count -= xfer;
return xfer;
}