linux-kernel - Re: [PATCH] befs: Don't pass huge structs by value.

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Message-ID: <AANLkTinOD=ovyk5CdBeJf7e0cPeGP_WUE=ZFArWrvBe2@mail.gmail.com>
Date:	Sun, 26 Dec 2010 09:48:39 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, Will Dyson <will_dyson@...ox.com>,
	Makoto Kato <m_kato@....so-net.ne.jp>,
	"Sergey S. Kostyliov" <rathamahata@...4.ru>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] befs: Don't pass huge structs by value.

On Sat, Dec 25, 2010 at 20:27, Jesper Juhl <jj@...osbits.net> wrote:
> 'struct befs_disk_data_stream' is huge (~144 bytes) and it's being passed
> by value in fs/befs/endian.h::cpu_to_fsrun().
>
> It seems to me that it would be better to pass a pointer, no?
> This patch changes the function to take a pointer to the large struct.
>
> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> ---
>  endian.h   |   16 ++++++++--------
>  linuxvfs.c |    2 +-
>  2 files changed, 9 insertions(+), 9 deletions(-)
>
>  Compile tested only. I have no way to test this.
>
> diff --git a/fs/befs/endian.h b/fs/befs/endian.h
> index 6cb84d8..a99caa0 100644
> --- a/fs/befs/endian.h
> +++ b/fs/befs/endian.h
> @@ -102,22 +102,22 @@ cpu_to_fsrun(const struct super_block *sb, befs_block_run n)
>  }
>
>  static inline befs_data_stream
> -fsds_to_cpu(const struct super_block *sb, befs_disk_data_stream n)
> +fsds_to_cpu(const struct super_block *sb, befs_disk_data_stream *n)

Please make befs_disk_data_stream const, so people don't accidentally modify it.

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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