linux-kernel - Re: [PATCHv2 01/10] xshm: Shared Memory layout for ST-E M7400 driver.

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Date:	Fri, 9 Dec 2011 14:45:56 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Sjur Brændeland <sjur.brandeland@...ricsson.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Paul Bolle <pebolle@...cali.nl>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCHv2 01/10] xshm: Shared Memory layout for ST-E M7400 driver.

On Friday 09 December 2011, Sjur Brændeland wrote:
> Add structures defining the channel configuration and the
> shared memory layout used for ST-Ericsson M7400.
> 
> These data structures are shared between the Linux host and the
> M7400 modem.
> 
> Signed-off-by: Sjur Brændeland <sjur.brandeland@...ricsson.com>
> ---
>  include/linux/xshm/xshm_ipctoc.h |  160 ++++++++++++++++++++++++++++++++++++++
>  1 files changed, 160 insertions(+), 0 deletions(-)
>  create mode 100644 include/linux/xshm/xshm_ipctoc.h

Generally, the include/linux path is for interfaces between modules, while
hardware data structures should be in the same directory as the driver using
them to provide an abstract interface.

> diff --git a/include/linux/xshm/xshm_ipctoc.h b/include/linux/xshm/xshm_ipctoc.h
> new file mode 100644
> index 0000000..b008c23
> --- /dev/null
> +++ b/include/linux/xshm/xshm_ipctoc.h
> @@ -0,0 +1,160 @@
> +/*
> + * Copyright (C) ST-Ericsson AB 2011
> + * Author: Sjur Brendeland / sjur.brandeland@...ricsson.com
> + * License terms: GNU General Public License (GPL) version 2
> + */
> +
> +#ifndef XSHM_TOC
> +#define XSHM_TOC
> +
> +/**
> + * DOC: XSHM Shared Memory Layout
> + *
> + * XSHM defines a set of structures describing the memory layout used
> + * for the Shared Memory IPC. In short &toc_entry points out &ipc_toc,
> + * which points out the &xshm_ipctoc_channel. &xshm_ipctoc_channel defines
> + * the channels used to communicate between host and external device (modem).
> + *
> + *  &xshm_ipctoc_channel can be used in packet-mode or stream-mode,
> + *  and points out &xshm_bufidx holding information about cirular
> + *  buffers, andtheir read/write indices etc.
> + */
> +
> +#pragma pack(1)

Better remove the #pragma. Marking data structures as packed when they
are already packed to start with only leads to worse optimizations in the
compiler, but does not have a functional impact.

	Arnd
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