linux-kernel - Re: userspace breakage in linux/nfsd/debug.h

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Date:	Thu, 02 Apr 2015 14:54:33 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Jeff Layton <jeff.layton@...marydata.com>
Cc:	Jeff Layton <jlayton@...marydata.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: userspace breakage in linux/nfsd/debug.h

On Thu, 2015-04-02 at 13:53 -0400, Jeff Layton wrote:
> On Thu, 2 Apr 2015 11:58:13 -0400
> Jeff Layton <jeff.layton@...marydata.com> wrote:
> 
> > On Thu, 02 Apr 2015 10:42:46 -0400
> > Mark Salter <msalter@...hat.com> wrote:
> > 
> > > This patch:
> > > 
> > >   commit f895b252d4edf66b2895fb5a7b17a638665f3e1f
> > >   Author: Jeff Layton <jlayton@...marydata.com>
> > >   Date:   Mon Nov 17 16:58:04 2014 -0500
> > > 
> > >     sunrpc: eliminate RPC_DEBUG
> > >     
> > >     It's always set to whatever CONFIG_SUNRPC_DEBUG is, so just use that.
> > >     
> > >     Signed-off-by: Jeff Layton <jlayton@...marydata.com>
> > >     Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
> > > 
> > > breaks userspace use of linux/nfsd/debug.h because of:
> > > 
> > >   diff --git a/include/uapi/linux/nfsd/debug.h b/include/uapi/linux/nfsd/debug.h
> > >   index a6f453c..1fdc95b 100644
> > >   --- a/include/uapi/linux/nfsd/debug.h
> > >   +++ b/include/uapi/linux/nfsd/debug.h
> > >   @@ -15,7 +15,7 @@
> > >     * Enable debugging for nfsd.
> > >     * Requires RPC_DEBUG.
> > >     */
> > >   -#ifdef RPC_DEBUG
> > >   +#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
> > >    # define NFSD_DEBUG		1
> > >    #endif
> > >  
> > > IS_ENABLED() is not available outside the kernel and causes a compile
> > > time failure:
> > > 
> > >   /usr/include/linux/nfsd/debug.h:18:15: error: missing binary operator before token "("
> > >  #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
> > > 
> > > 
> > > 
> > 
> > Huh, ok. Probably the right solution is to just get rid of NFSD_DEBUG
> > and convert all of the "#ifdef NFSD_DEBUG" statements into 
> > "#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)".
> > 
> > Then we can just remove that whole block from nfsd/debug.h altogether. Mike,
> > care to spin up a patch for that or shall I?
> > 
> 
> Uhh, sorry...I meant to say "Mark" there.
> 
> Mark, would you mind spinning up a patch for this or would you rather I
> do it?
> 
> Thanks,

I was wondering who Mike was. :)
Yeah, I can put a patch together.


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