linux-kernel - Re: [PATCH] staging: lustre: lprocfs_status.h: fix sparse error: symbol redeclared with different type

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Message-Id: <1475828980.5208.0@smtp.gmail.com>
Date:   Fri, 07 Oct 2016 10:29:40 +0200
From:   Samuele Baisi <ciccio87@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: lustre: lprocfs_status.h: fix sparse error:
 symbol redeclared with different type



Il giorno ven 7 ott 2016 alle 5:55, Greg KH 
<gregkh@...uxfoundation.org> ha scritto:
> On Thu, Oct 06, 2016 at 06:52:07PM +0200, Samuele Baisi wrote:
>>  drivers/staging/lustre/lustre/obdclass/lprocfs_status.c:1554:5: 
>> error:
>>  symbol 'lprocfs_wr_root_squash' redeclared with different type 
>> (originally
>>  declared at 
>> drivers/staging/lustre/lustre/obdclass/../include/lprocfs_status.h:704)
>>  - incompatible argument 1 (different address spaces)
>> 
>>  drivers/staging/lustre/lustre/obdclass/lprocfs_status.c:1618:5: 
>> error:
>>  symbol 'lprocfs_wr_nosquash_nids' redeclared with different type 
>> (originally
>>  declared at 
>> drivers/staging/lustre/lustre/obdclass/../include/lprocfs_status.h:706)
>>  - incompatible argument 1 (different address spaces)
>> 
>>  Added __user annotation to the header definitions arguments (which 
>> are
>>  indeed userspace buffers).
> 
> Are they really?  Have you tested this?  The last time this was looked
> at, it was a non-trivial problem...

No, I haven't really tested it, I just saw they're treated like 
userspace
buffers (copy_from_user) in the function body.

if (copy_from_user(kernbuf, buffer, count)) {
  errmsg = "bad address";
  rc = -EFAULT;
  goto failed_noprint;
 }

if (copy_from_user(kernbuf, buffer, count)) {
  errmsg = "bad address";
  rc = -EFAULT;
  goto failed;
 }

> And any reason you didn't cc the lustre maintainers with this change?
> If you think it is correct, please resend it with the testing
> information and cc: them.

No, it was a mistake on my part, I thought to CC lustre-devel, but it 
seems not to be
public access and then I forgot to add a Lustre mantainer.

Anyway, I do not think I'm going to have a chanche to really test it, 
so it's probably
better to dismiss the matter.

Sorry for having wasted your time.

> 
> thanks,
> 
> greg k-h

Thank you and best regards.