linux-kernel - Re: usr/include/linux/soundcard.h warnings for 'make headers

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Date:	Wed, 4 Feb 2009 15:02:07 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Takashi Iwai <tiwai@...e.de>, Sam Ravnborg <sam@...nborg.org>,
	alsa-devel@...a-project.org, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: usr/include/linux/soundcard.h warnings for 'make headers_check'

On Wednesday 04 February 2009, Jaswinder Singh Rajput wrote:
> > +#define _SEQ_EXTERN extern
> > +#define SEQ_USE_EXTBUF() \
> > +             _SEQ_EXTERN unsigned char _seqbuf[]; \
> > +             _SEQ_EXTERN int _seqbuflen;_SEQ_EXTERN int _seqbufptr
> 
> hmm, you rename snake as rope, but actually snake is still there ;-)

Yes, that's true.

The alternative would be to remove all those macros entirely, breaking
also the applications from number 2 in my list.

I see this header as another example of the byteorder.h type where
a kernel header provides functionality that is used by existing
applications. While it should have been part of a library to start
with, we cannot change it any more now without breaking stuff.

Maybe a comment should be added to clarify this.

	Arnd <><

--- a/include/linux/soundcard.h
+++ b/include/linux/soundcard.h
@@ -1050,7 +1050,17 @@ typedef struct mixer_vol_table {
  *	Some convenience macros to simplify programming of the
  *	/dev/sequencer interface
  *
- *	These macros define the API which should be used when possible.
+ *	This is a legacy interface for applications written against
+ *	the OSSlib-3.8 style interface. It is no longer possible
+ *	to actually link against OSSlib with this header, but we
+ *	still provide these macros for programs using them.
+ *
+ *	If you want to use OSSlib, it is recommended that you get
+ *	the GPL version of OSS-4.x and build against that version
+ *	of the header.
+ *
+ *	We redefine the extern keyword so that make headers_check
+ *	does not complain about SEQ_USE_EXTBUF.
  */
 #define SEQ_DECLAREBUF()		SEQ_USE_EXTBUF()
 
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