linux-kernel - Re: [PATCH v4 1/8] staging: zcache: introduce zero-filled pages handler

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Message-ID: <CAMuHMdUTsHs0-5=kYLMHYGTxBiCAGB33KZH0wvz51vgtExjK8Q@mail.gmail.com>
Date:	Sat, 23 Mar 2013 20:31:11 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Linux-Next <linux-next@...r.kernel.org>
Subject: Re: [PATCH v4 1/8] staging: zcache: introduce zero-filled pages handler

On Tue, Mar 19, 2013 at 10:25 AM, Wanpeng Li <liwanp@...ux.vnet.ibm.com> wrote:
> Introduce zero-filled pages handler to capture and handle zero pages.
>
> Acked-by: Dan Magenheimer <dan.magenheimer@...cle.com>
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
> ---
>  drivers/staging/zcache/zcache-main.c |   26 ++++++++++++++++++++++++++
>  1 files changed, 26 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
> index 328898e..d73dd4b 100644
> --- a/drivers/staging/zcache/zcache-main.c
> +++ b/drivers/staging/zcache/zcache-main.c

> +static void handle_zero_filled_page(void *page)
> +{
> +       void *user_mem;
> +
> +       user_mem = kmap_atomic(page);

kmap_atomic() takes a "struct page *", not a "void *".

> +       memset(user_mem, 0, PAGE_SIZE);
> +       kunmap_atomic(user_mem);
> +
> +       flush_dcache_page(page);

While flush_dcache_page() is a no-op on many architectures, it also
takes a "struct page *", not a "void *":

m68k/allmodconfig:

drivers/staging/zcache/zcache-main.c:309:2: error: request for member
'virtual' in something not a structure or union

Cfr. http://kisskb.ellerman.id.au/kisskb/buildresult/8433711/

> +}

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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