netdev - Re: [RFC] situation with csum_and_copy

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Message-ID: <20141122033639.GY7996@ZenIV.linux.org.uk>
Date:	Sat, 22 Nov 2014 03:36:39 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, target-devel@...r.kernel.org,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Christoph Hellwig <hch@...radead.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [RFC] situation with csum_and_copy_... API

On Sat, Nov 22, 2014 at 03:27:18AM +0000, Al Viro wrote:
  
> @@ -566,38 +445,15 @@ static size_t copy_to_iter_bvec(void *from, size_t bytes, struct iov_iter *i)
[snip]
> +	iterate_bvec(i, bytes, page, off, len, true,
> +		     memcpy_from_page((from += len) - len, page, off, len))

should be
+		     memcpy_to_page(page, off, (from += len) - len, len))

and

> @@ -605,35 +461,9 @@ static size_t copy_from_iter_bvec(void *to, size_t bytes, struct iov_iter *i)
[snip]
> +	iterate_bvec(i, bytes, page, off, len, true,
> +		     memcpy_to_page(page, off, (to += len) - len, len))

should be
+		     memcpy_from_page((to += len) - len, page, off, len))

Sorry, wrong delta.
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