linux-kernel - Re: [PATCH 1/4] container_of: add container_of_const() that preserves const-ness of the pointer

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Date:   Thu, 1 Dec 2022 20:46:12 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH 1/4] container_of: add container_of_const() that
 preserves const-ness of the pointer

On Fri, Dec 02, 2022 at 12:50:05AM +0200, Andy Shevchenko wrote:
> On Thu, Dec 01, 2022 at 08:30:54PM +0100, Greg Kroah-Hartman wrote:
> > container_of does not preserve the const-ness of a pointer that is
> > passed into it, which can cause C code that passes in a const pointer to
> > get a pointer back that is not const and then scribble all over the data
> > in it.  To prevent this, container_of_const() will preserve the const
> > status of the pointer passed into it using the newly available _Generic()
> > method.
> > 
> > Co-developed-by: Jason Gunthorpe <jgg@...pe.ca>
> 
> I believe this tag requires SoB of the co-develper.

Sure, Greg you can add whatever tags are required

Did you look at possibly just calling this "container_of" ?

Thanks,
Jason