linux-kernel - Re: [PATCH 6/9] nfsd: fix empty-body warning in nfs4state.c

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Message-Id: <B4067786-F04F-4CE5-B84B-DE5BB0890529@oracle.com>
Date:   Sat, 18 Apr 2020 18:33:35 -0400
From:   Chuck Lever <chuck.lever@...cle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Bruce Fields <bfields@...ldses.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "zzy@...wysm.com" <zzy@...wysm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "johannes@...solutions.net" <johannes@...solutions.net>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>
Subject: Re: [PATCH 6/9] nfsd: fix empty-body warning in nfs4state.c



> On Apr 18, 2020, at 6:32 PM, Randy Dunlap <rdunlap@...radead.org> wrote:
> 
> On 4/18/20 3:28 PM, Trond Myklebust wrote:
>> On Sat, 2020-04-18 at 14:45 -0400, Chuck Lever wrote:
>>>> On Apr 18, 2020, at 2:41 PM, Randy Dunlap <rdunlap@...radead.org>
>>>> wrote:
>>>> 
>>>> Fix gcc empty-body warning when -Wextra is used:
>>>> 
>>>> ../fs/nfsd/nfs4state.c:3898:3: warning: suggest braces around empty
>>>> body in an ‘else’ statement [-Wempty-body]
>>>> 
>>>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>>>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>>>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>>>> Cc: "J. Bruce Fields" <bfields@...ldses.org>
>>>> Cc: Chuck Lever <chuck.lever@...cle.com>
>>>> Cc: linux-nfs@...r.kernel.org
>>> 
>>> I have a patch in my queue that addresses this particular warning,
>>> but your change works for me too.
>>> 
>>> Acked-by: Chuck Lever <chuck.lever@...cle.com>
>>> 
>>> Unless Bruce objects.
>>> 
>>> 
>>>> ---
>>>> fs/nfsd/nfs4state.c |    3 ++-
>>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>> 
>>>> --- linux-next-20200417.orig/fs/nfsd/nfs4state.c
>>>> +++ linux-next-20200417/fs/nfsd/nfs4state.c
>>>> @@ -34,6 +34,7 @@
>>>> 
>>>> #include <linux/file.h>
>>>> #include <linux/fs.h>
>>>> +#include <linux/kernel.h>
>>>> #include <linux/slab.h>
>>>> #include <linux/namei.h>
>>>> #include <linux/swap.h>
>>>> @@ -3895,7 +3896,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp
>>>> 		copy_clid(new, conf);
>>>> 		gen_confirm(new, nn);
>>>> 	} else /* case 4 (new client) or cases 2, 3 (client reboot): */
>>>> -		;
>>>> +		do_empty();
>> 
>> Urgh... This is just for documentation purposes anyway, so why not just
>> turn it all into a comment by moving the 'else' into the comment field?
>> 
>> i.e.
>> 	} /* else case 4 (.... */
>> 
>> 	new->cl_minorversion = 0;
>>>> 	gen_callback(new, setclid, rqstp);
>>>> 	add_to_unconfirmed(new);
> 
> Like I said earlier, since Chuck has a patch that addresses this,
> let's just go with that.

I'll post that patch for review as part of my NFSD for-5.8 patches.


--
Chuck Lever