linux-kernel - Re: [PATCH]: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes

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Date:	Thu, 7 Jun 2007 21:48:09 -0700
From:	Greg KH <greg@...ah.com>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	"linux-acpi@...r" <linux-acpi@...r.kernel.org>, lenb@...nel.org
Subject: Re: [PATCH]: add parameter "struct bin_attribute *" in
	.read/.write methods for sysfs binary attributes

On Thu, Jun 07, 2007 at 05:31:35PM +0800, Zhang Rui wrote:
> From: Zhang Rui <rui.zhang@...el.com>
> 
> Well, first of all, I don't want to change so many files either.
> 
> What I do:
> Adding a new parameter "struct bin_attribute *" in the
> .read/.write methods for the sysfs binary attributes.
> 
> In fact, only the four lines change in fs/sysfs/bin.c and
> include/linux/sysfs.h do the real work.
> But I have to update all the files that use binary attributes
> to make them compatible with the new .read and .write methods.
> I'm not sure if I missed any. :(
> 
> Why I do this:
> For a sysfs attribute, we can get a pointer pointing to the
> struct attribute in the .show/.store method,
> while we can't do this for the binary attributes.
> I don't know why this is different, but this does make it not
> so handy to use the binary attributes as the regular ones.
> So I think this patch is reasonable. :)
> 
> Who benefits from it:
> The patch that exposes ACPI tables in sysfs
> requires such an improvement.
> All the table binary attributes share the same .read method.
> Parameter "struct bin_attribute *" is used to get
> the table signature and instance number which are used to
> distinguish different ACPI table binary attributes.
> 
> Without this parameter, we need to offer different .read methods
> for different ACPI table binary attributes.
> This is impossible as there are various ACPI tables on different
> platforms, and we don't know what they are until they are loaded.

I have no objection to this patch but it failes the checkpatch.pl script
pretty badly with too long of lines.  Care to fix it up and resend it?

thanks,

greg k-h
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