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

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Date:	Thu, 2 Apr 2015 11:58:13 -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, 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?

-- 
Jeff Layton <jeff.layton@...marydata.com>
--
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