linux-kernel - Re: [PATCH] vhost: reduce stack usage in log

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Date:   Tue, 15 Sep 2020 15:53:15 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Li Wang <li.wang@...driver.com>, mst@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vhost: reduce stack usage in log_used


On 2020/9/15 上午2:08, Li Wang wrote:
> Fix the warning: [-Werror=-Wframe-larger-than=]
>
> drivers/vhost/vhost.c: In function log_used:
> drivers/vhost/vhost.c:1906:1:
> warning: the frame size of 1040 bytes is larger than 1024 bytes
>
> Signed-off-by: Li Wang <li.wang@...driver.com>
> ---
>   drivers/vhost/vhost.c | 2 +-
>   drivers/vhost/vhost.h | 1 +
>   2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index b45519c..31837a5
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -1884,7 +1884,7 @@ static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len)
>   
>   static int log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len)
>   {
> -	struct iovec iov[64];
> +	struct iovec *iov = vq->log_iov;
>   	int i, ret;
>   
>   	if (!vq->iotlb)
> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> index 9032d3c..5fe4b47
> --- a/drivers/vhost/vhost.h
> +++ b/drivers/vhost/vhost.h
> @@ -123,6 +123,7 @@ struct vhost_virtqueue {
>   	/* Log write descriptors */
>   	void __user *log_base;
>   	struct vhost_log *log;
> +	struct iovec log_iov[64];
>   
>   	/* Ring endianness. Defaults to legacy native endianness.
>   	 * Set to true when starting a modern virtio device. */


Acked-by: Jason Wang <jasowang@...hat.com>