linux-kernel - Re: [PATCH 4 of 5] virtio: avoid modulus operation

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Message-ID: <CAOJsxLEt6_y7jw0bRsaita4gfb2k+BAQMeRLs9PcHntGVSFvaQ@mail.gmail.com>
Date:	Thu, 3 Nov 2011 09:51:15 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	MichaelS.Tsirkist@...hat.com,
	Christoph Hellwig <hch@...radead.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4 of 5] virtio: avoid modulus operation

On Thu, Nov 3, 2011 at 9:42 AM, Rusty Russell <rusty@...tcorp.com.au> wrote:
> Since we know vq->vring.num is a power of 2, modulus is lazy (it's asserted
> in vring_new_virtqueue()).
>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> ---
>  drivers/virtio/virtio_ring.c |   10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
> --- a/arch/x86/lguest/boot.c
> +++ b/arch/x86/lguest/boot.c
> @@ -1420,7 +1420,7 @@ __init void lguest_init(void)
>        add_preferred_console("hvc", 0, NULL);
>
>        /* Register our very early console. */
> -       virtio_cons_early_init(early_put_chars);
> +//     virtio_cons_early_init(early_put_chars);

What's this hunk here?
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