linux-kernel - Re: [PATCH try#2] [MTD/MAPS] Blackfin BF5xx Maps: Handle the case where flash memory and ethernet mac/phy are mapped onto the same async bank

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Date:	Mon, 12 May 2008 22:37:53 +0800
From:	"Bryan Wu" <cooloney@...nel.org>
To:	"Mike Frysinger" <vapier.adi@...il.com>
Cc:	"Jörn Engel" <joern@...fs.org>,
	"Bryan Wu" <bryan.wu@...log.com>, dwmw2@...radead.org,
	will.newton@...il.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH try#2] [MTD/MAPS] Blackfin BF5xx Maps: Handle the case where flash memory and ethernet mac/phy are mapped onto the same async bank

On Mon, May 12, 2008 at 8:48 PM, Mike Frysinger <vapier.adi@...il.com> wrote:
> On Mon, May 12, 2008 at 8:26 AM, Jörn Engel <joern@...fs.org> wrote:
>  > On Sun, 3 February 2008 14:32:35 +0800, Bryan Wu wrote:
>  >> +static void bf5xx_copy_from(struct map_info *map, void *to,
>  unsigned long from, ssize_t len)
>  >> +{
>  >> +     unsigned long i;
>  >> +     map_word test;
>  >> +
>  >> +     if ((unsigned long)to & 0x1) {
>  >> +             for (i = 0; i < len / 2 * 2; i += 2) {
>  >> +                     test = bf5xx_read(map, from + i);
>  >> +                     put_unaligned(test.x[0], (__le16 *)(to + i));
>  >> +             }
>  >> +     } else {
>  >> +             for (i = 0; i < len / 2 * 2; i += 2) {
>  >> +                     test = bf5xx_read(map, from + i);
>  >> +                     *((u16*)(to + i)) = test.x[0];
>  >                        ^^^^^^^^^^^^^^^^^
>  >
>  > I'm not particularly fond of such constructs, maybe because I have such
>  > a hard time understanding what the code actually does.
>  >
>  > How about:
>  >        u16 *foo = to;
>  >
>  >        for (i = 0; i < (len & ~1); i++) {
>  >                test = bf5xx_read(map, from + 2 * i);
>  >                foo[i] = test.x[0];
>  >        }
>  >
>  > With perhaps a better name than "foo" and the same conversion in the
>  > rest of the function as well?
>
>  indeed.  Bryan: i can take care of this as there's a few other pieces
>  i want to fiddle first (like getting rid of "bf5xx")
>  -mike
>

My pleasure. Thanks.
This patch has been in my queue for a long time

-Bryan
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