linux-kernel - Re: [lustre-devel] [PATCH] staging: lustre: Fix a spatch warning due to an assignment from kernel to user space

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Date:   Wed, 7 Dec 2016 12:22:41 -0500
From:   Oleg Drokin <oleg.drokin@...el.com>
To:     Quentin Lambert <lambert.quentin@...il.com>
Cc:     Andreas Dilger <andreas.dilger@...el.com>,
        James Simmons <jsimmons@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <lustre-devel@...ts.lustre.org>, <devel@...verdev.osuosl.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [lustre-devel] [PATCH] staging: lustre: Fix a spatch warning due to an assignment from kernel to user space


On Dec 7, 2016, at 10:20 AM, Quentin Lambert wrote:

> Hi all,
> 
> I am looking at the drivers/staging/lustre/lustre/llite/dir.c:
> 
> 1469                 /* Call mdc_iocontrol */
> 1470                 rc = obd_iocontrol(LL_IOC_FID2MDTIDX, exp, sizeof(fid), &fid,
> 1471                                    &index);
> 1472                 if (rc)
> 
> and sparse says:
> 
> drivers/staging/lustre/lustre/llite/dir.c:1471:37: warning: incorrect type in argument 5 (different address spaces)
> 
> I was wondering if there was any value to add a cast to fix the warning?

These's a sister warning to this one, btw, in
drivers/staging/lustre/lustre/lmv/lmv_obd.c:996:19: warning: cast removes address space of expression

It is an ugly kludge and I guess needs to just be reworked somehow instead to avoid
these ugly games.