linux-kernel - Re: [PATCH 6/6] net/9p: Fix compile warning

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Message-ID: <AANLkTincqAPaXGysa_y5vw8Wj8dru9MCxXvyqETojuki@mail.gmail.com>
Date:	Sat, 19 Mar 2011 21:12:04 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
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: [PATCH 6/6] net/9p: Fix compile warning

These warnings?

net/9p/trans_common.c:45: warning: cast from pointer to integer of
different size
net/9p/trans_common.c:46: warning: cast from pointer to integer of
different size
net/9p/trans_common.c:72: warning: comparison of distinct pointer
types lacks a cast

On Tue, Mar 1, 2011 at 09:51, Aneesh Kumar K.V
<aneesh.kumar@...ux.vnet.ibm.com> wrote:
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  net/9p/trans_common.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/net/9p/trans_common.c b/net/9p/trans_common.c
> index d62b9aa..ca55e3b 100644
> --- a/net/9p/trans_common.c
> +++ b/net/9p/trans_common.c
> @@ -42,8 +42,8 @@ int
>  p9_nr_pages(struct p9_req_t *req)
>  {
>        int start_page, end_page;

In addition, the values may not fit in an int on 64-bit. Better use
'unsigned long'.

> -       start_page =  (unsigned long long)req->tc->pubuf >> PAGE_SHIFT;
> -       end_page = ((unsigned long long)req->tc->pubuf + req->tc->pbuf_size +
> +       start_page =  (unsigned long)req->tc->pubuf >> PAGE_SHIFT;
> +       end_page = ((unsigned long)req->tc->pubuf + req->tc->pbuf_size +
>                        PAGE_SIZE - 1) >> PAGE_SHIFT;
>        return end_page - start_page;
>  }
> @@ -69,8 +69,8 @@ p9_payload_gup(struct p9_req_t *req, size_t *pdata_off, int *pdata_len,
>        *pdata_off = (size_t)req->tc->pubuf & (PAGE_SIZE-1);
>
>        if (*pdata_off)
> -               first_page_bytes = min((PAGE_SIZE - *pdata_off),
> -                               req->tc->pbuf_size);
> +               first_page_bytes = min(((size_t)PAGE_SIZE - *pdata_off),
> +                                      req->tc->pbuf_size);
>
>        rpinfo = req->tc->private;
>        pdata_mapped_pages = get_user_pages_fast((unsigned long)req->tc->pubuf,
> --
> 1.7.1

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
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