linux-kernel - Re: [V9fs-developer] [PATCH 5/5] 9p: Fix sparse error

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Date:	Fri, 25 Mar 2011 14:26:53 -0700
From:	Venkateswararao Jujjuri <jvrao@...ux.vnet.ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	v9fs-developer@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [V9fs-developer] [PATCH 5/5] 9p: Fix sparse error

On 03/25/2011 04:30 AM, Aneesh Kumar K.V wrote:
> Signed-off-by: Aneesh Kumar K.V<aneesh.kumar@...ux.vnet.ibm.com>
Reviewed-by : Venkateswararao Jujjuri <jvrao@...ux.vnet.ibm.com>
> ---
>   net/9p/protocol.c     |    3 ++-
>   net/9p/trans_common.c |    2 +-
>   net/9p/trans_virtio.c |   15 +++++++++++----
>   3 files changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/net/9p/protocol.c b/net/9p/protocol.c
> index 8a4084f..a7e8997 100644
> --- a/net/9p/protocol.c
> +++ b/net/9p/protocol.c
> @@ -468,7 +468,8 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
>   		case 'E':{
>   				 int32_t cnt = va_arg(ap, int32_t);
>   				 const char *k = va_arg(ap, const void *);
> -				 const char *u = va_arg(ap, const void *);
> +				 const char __user *u = va_arg(ap,
> +							const void __user *);
>   				 errcode = p9pdu_writef(pdu, proto_version, "d",
>   						 cnt);
>   				 if (!errcode&&  pdu_write_urw(pdu, k, u, cnt))
> diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
> index 9172ab7..14265e8 100644
> --- a/net/9p/trans_common.c
> +++ b/net/9p/trans_common.c
> @@ -66,7 +66,7 @@ p9_payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len,
>   	uint32_t pdata_mapped_pages;
>   	struct trans_rpage_info  *rpinfo;
>
> -	*pdata_off = (size_t)req->tc->pubuf&  (PAGE_SIZE-1);
> +	*pdata_off = (__force size_t)req->tc->pubuf&  (PAGE_SIZE-1);
>
>   	if (*pdata_off)
>   		first_page_bytes = min(((size_t)PAGE_SIZE - *pdata_off),
> diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
> index e8f046b..244e707 100644
> --- a/net/9p/trans_virtio.c
> +++ b/net/9p/trans_virtio.c
> @@ -326,8 +326,11 @@ req_retry_pinned:
>   			outp = pack_sg_list_p(chan->sg, out, VIRTQUEUE_NUM,
>   					pdata_off, rpinfo->rp_data, pdata_len);
>   		} else {
> -			char *pbuf = req->tc->pubuf ? req->tc->pubuf :
> -								req->tc->pkbuf;
> +			char *pbuf;
> +			if (req->tc->pubuf)
> +				pbuf = (__force char *) req->tc->pubuf;
> +			else
> +				pbuf = req->tc->pkbuf;
>   			outp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, pbuf,
>   					req->tc->pbuf_size);
>   		}
> @@ -352,8 +355,12 @@ req_retry_pinned:
>   			in = pack_sg_list_p(chan->sg, out+inp, VIRTQUEUE_NUM,
>   					pdata_off, rpinfo->rp_data, pdata_len);
>   		} else {
> -			char *pbuf = req->tc->pubuf ? req->tc->pubuf :
> -								req->tc->pkbuf;
> +			char *pbuf;
> +			if (req->tc->pubuf)
> +				pbuf = (__force char *) req->tc->pubuf;
> +			else
> +				pbuf = req->tc->pkbuf;
> +
>   			in = pack_sg_list(chan->sg, out+inp, VIRTQUEUE_NUM,
>   					pbuf, req->tc->pbuf_size);
>   		}

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