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

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Message-ID: <20150402135323.18416d48@tlielax.poochiereds.net>
Date:	Thu, 2 Apr 2015 13:53:23 -0400
From:	Jeff Layton <jeff.layton@...marydata.com>
To:	Mark Salter <msalter@...hat.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, 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,
-- 
Jeff Layton <jeff.layton@...marydata.com>
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