netdev - Re: [PATCH] mvme147: use correct order of ram pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMuHMdV-g35ijLgcE=sSM3eE+fCxC1WOiAX2PaWs0z4-+bDP+A@mail.gmail.com>
Date:	Wed, 28 May 2014 09:51:39 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Amos Kong <akong@...hat.com>
Cc:	"Linux/m68k" <linux-m68k@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] mvme147: use correct order of ram pages

Hi Amos,

On Wed, May 28, 2014 at 6:07 AM, Amos Kong <akong@...hat.com> wrote:
> 16K is 2^2 * PAGE_SIZE, so the page order should be 2, not 3.
>
> This patch uses get_order() to get correct order, and fixes
> one typo in comment.

Thanks for your patch!

> Signed-off-by: Amos Kong <akong@...hat.com>
> ---
> This patch wasn't built. Geert, can you help to test it?
> I don't know if it needs a head file by using get_order().

It builds fine. The get_order() is nicely expanded to "2" in the assembler
output.

Now, I'd like to get some feedback from the MVME hackers first.
Perhaps the comment was wrong?

> -/* We have 16834 bytes of RAM for the init block and buffers. This places
> +/* We have 16384 bytes of RAM for the init block and buffers. This places
>   * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
>   * buffers and 2 Tx buffers.
>   */
> +#define M147LANCE_RAM_SIZE   16384 /* 16K */
>  #define LANCE_LOG_TX_BUFFERS 1
>  #define LANCE_LOG_RX_BUFFERS 3

BTW,I also find it fishy why the driver uses only 1+3 buffers, since more
RAM is available.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html