linux-kernel - Re: [PATCH] staging: wlan-ng: silence incorrect type in argument 1 (different address spaces) warning

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Date:   Fri, 23 Apr 2021 23:11:05 -0700
From:   Joe Perches <joe@...ches.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ashish Kalra <eashishkalra@...il.com>
Cc:     Abheek Dhawan <adawesomeguy222@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Romain Perier <romain.perier@...il.com>,
        Waiman Long <longman@...hat.com>,
        Allen Pais <apais@...ux.microsoft.com>,
        Ivan Safonov <insafonov@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wlan-ng: silence incorrect type in argument 1
 (different address spaces) warning

On Sat, 2021-04-24 at 08:00 +0200, Greg Kroah-Hartman wrote:
> On Fri, Apr 23, 2021 at 08:56:19PM +0530, Ashish Kalra wrote:
> > On Thu, Apr 22, 2021 at 10:43:13AM +0200, Greg Kroah-Hartman wrote:
> > > On Tue, Apr 20, 2021 at 02:31:42PM +0530, Ashish Kalra wrote:
> > > > Upon running sparse, "warning: incorrect type in argument 1 (different address spaces)
> > > > is brought to notice for this file.let's add correct typecast to make it cleaner and
> > > > silence the Sparse warning.
[]
> >  struct p80211ioctl_req {
> >         char name[WLAN_DEVNAMELEN_MAX];
> > -       caddr_t data;
> > +       void __user *data;
> > 
> > Does this looks ok to you and is there any other check possible if this is ok?
> 
> Wait, what is "caddr_t"?  Try unwinding that mess first...

Might not be that simple.

include/linux/types.h:typedef __kernel_caddr_t  caddr_t;
include/uapi/linux/coda.h:typedef void * caddr_t;
include/uapi/asm-generic/posix_types.h:typedef char *           __kernel_caddr_t;