linux-kernel - Re: [PATCH] staging: unisys: visorbus: constify attribute

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Message-ID: <20170717123734.GA30411@kroah.com>
Date:   Mon, 17 Jul 2017 14:37:34 +0200
From:   Greg KH <greg@...ah.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>
Cc:     david.kershner@...sys.com, Timothy.Sell@...sys.com,
        bryan.thompson@...sys.com, jon.frisch@...sys.com,
        david.binder@...sys.com, sparmaintainer@...sys.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: unisys: visorbus: constify attribute_group
 structures.

On Mon, Jul 17, 2017 at 05:43:14PM +0530, Arvind Yadav wrote:
> Hi Greg,
> 
> 
> On Monday 17 July 2017 04:15 PM, Greg KH wrote:
> > On Mon, Jul 17, 2017 at 02:55:37PM +0530, Arvind Yadav wrote:
> > > attribute_groups are not supposed to change at runtime. All functions
> > > working with attribute_groups provided by <linux/sysfs.h> work
> > > with const attribute_group. So mark the non-const structs as const.
> > > 
> > > Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> > > ---
> > >   drivers/staging/unisys/visorbus/visorbus_main.c | 4 ++--
> > >   drivers/staging/unisys/visorbus/visorchipset.c  | 2 +-
> > >   2 files changed, 3 insertions(+), 3 deletions(-)
> > Why not just use the ATTRIBUTE_GROUPS() macro for these?  Or is there
> > something that is preventing that?
> Yes, we can use. if we are only initializing '.attrs'.
> ATTRIBUTE_GROUPS() will not work if we will initialize other member of
> attribute_group like 'bin_attrs', 'is_visible', and  'name'.

That means you should redo this patch :)

Also, your changelog text had a typo, it is "attribute_group", not
"attribute_groups".

thanks,

greg k-h